build: update gnulib to latest and adapt; update bootstrap, too

Blindly updating to the latest from gnulib, bootstrap would
fail due to failure of our local patches to apply.  Hence,
these first two updates.
* gl/lib/regex_internal.c.diff: Update offsets, so this patch
applies to the latest from gnulib.
* gl/lib/regex_internal.h.diff: Remove file.  No longer needed.
* bootstrap: Update from gnulib.

bootstrap

@@ -1,6 +1,6 @@
 #! /bin/sh
 # Print a version string.
-scriptversion=2012-07-19.14; # UTC
+scriptversion=2013-01-20.16; # UTC
 
 # Bootstrap this package from checked-out sources.
 
@@ -306,34 +306,34 @@ if test -n "$checkout_only_file" && test ! -r "$checkout_only_file"; then
   die "Bootstrapping from a non-checked-out distribution is risky."
 fi
 
-# Ensure that lines starting with ! sort last, per gitignore conventions
-# for whitelisting exceptions after a more generic blacklist pattern.
-sort_patterns() {
-  sort -u "$@" | sed '/^!/ {
-    H
-    d
-  }
-  $ {
-    P
-    x
-    s/^\n//
-  }' | sed '/^$/d'
+# Strip blank and comment lines to leave significant entries.
+gitignore_entries() {
+  sed '/^#/d; /^$/d' "$@"
 }
 
-# If $STR is not already on a line by itself in $FILE, insert it,
-# sorting the new contents of the file and replacing $FILE with the result.
-insert_sorted_if_absent() {
+# If $STR is not already on a line by itself in $FILE, insert it at the start.
+# Entries are inserted at the start of the ignore list to ensure existing
+# entries starting with ! are not overridden.  Such entries support
+# whitelisting exceptions after a more generic blacklist pattern.
+insert_if_absent() {
   file=$1
   str=$2
   test -f $file || touch $file
-  echo "$str" | sort_patterns - $file | cmp -s - $file > /dev/null \
-    || { echo "$str" | sort_patterns - $file > $file.bak \
-      && mv $file.bak $file; } \
-    || die "insert_sorted_if_absent $file $str: failed"
+  test -r $file || die "Error: failed to read ignore file: $file"
+  duplicate_entries=$(gitignore_entries $file | sort | uniq -d)
+  if [ "$duplicate_entries" ] ; then
+    die "Error: Duplicate entries in $file: " $duplicate_entries
+  fi
+  linesold=$(gitignore_entries $file | wc -l)
+  linesnew=$(echo "$str" | gitignore_entries - $file | sort -u | wc -l)
+  if [ $linesold != $linesnew ] ; then
+    { echo "$str" | cat - $file > $file.bak && mv $file.bak $file; } \
+      || die "insert_if_absent $file $str: failed"
+  fi
 }
 
 # Adjust $PATTERN for $VC_IGNORE_FILE and insert it with
-# insert_sorted_if_absent.
+# insert_if_absent.
 insert_vc_ignore() {
   vc_ignore_file="$1"
   pattern="$2"
@@ -344,7 +344,7 @@ insert_vc_ignore() {
     # .gitignore entry.
     pattern=$(echo "$pattern" | sed s,^,/,);;
   esac
-  insert_sorted_if_absent "$vc_ignore_file" "$pattern"
+  insert_if_absent "$vc_ignore_file" "$pattern"
 }
 
 # Die if there is no AC_CONFIG_AUX_DIR($build_aux) line in configure.ac.
@@ -889,20 +889,21 @@ find "$m4_base" "$source_base" \
   -depth \( -name '*.m4' -o -name '*.[ch]' \) \
   -type l -xtype l -delete > /dev/null 2>&1
 
+# Invoke autoreconf with --force --install to ensure upgrades of tools
+# such as ylwrap.
+AUTORECONFFLAGS="--verbose --install --force -I $m4_base $ACLOCAL_FLAGS"
+
 # Some systems (RHEL 5) are using ancient autotools, for which the
 # --no-recursive option had not been invented.  Detect that lack and
 # omit the option when it's not supported.  FIXME in 2017: remove this
 # hack when RHEL 5 autotools are updated, or when they become irrelevant.
-no_recursive=
 case $($AUTORECONF --help) in
-  *--no-recursive*) no_recursive=--no-recursive;;
+  *--no-recursive*) AUTORECONFFLAGS="$AUTORECONFFLAGS --no-recursive";;
 esac
 
 # Tell autoreconf not to invoke autopoint or libtoolize; they were run above.
-echo "running: AUTOPOINT=true LIBTOOLIZE=true " \
-    "$AUTORECONF --verbose --install $no_recursive -I $m4_base $ACLOCAL_FLAGS"
-AUTOPOINT=true LIBTOOLIZE=true \
-    $AUTORECONF --verbose --install $no_recursive -I $m4_base $ACLOCAL_FLAGS \
+echo "running: AUTOPOINT=true LIBTOOLIZE=true $AUTORECONF $AUTORECONFFLAGS"
+AUTOPOINT=true LIBTOOLIZE=true $AUTORECONF $AUTORECONFFLAGS \
   || die "autoreconf failed"
 
 # Get some extra files from gnulib, overriding existing files.

gl/lib/regex_internal.c.diff

@@ -2,7 +2,7 @@ diff --git a/lib/regex_internal.c b/lib/regex_internal.c
 index 904b88e..61c8d9d 100644
 --- a/lib/regex_internal.c
 +++ b/lib/regex_internal.c
-@@ -18,6 +18,8 @@
+@@ -17,6 +17,8 @@
     with this program; if not, write to the Free Software Foundation,
     Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
 
@@ -11,7 +11,7 @@ index 904b88e..61c8d9d 100644
  static void re_string_construct_common (const char *str, Idx len,
  					re_string_t *pstr,
  					RE_TRANSLATE_TYPE trans, bool icase,
-@@ -1390,7 +1392,10 @@ static void
+@@ -1394,7 +1396,10 @@ static void
  internal_function
  re_node_set_remove_at (re_node_set *set, Idx idx)
  {

gl/lib/regex_internal.h.diff

@@ -1,14 +0,0 @@
-diff --git i/lib/regex_internal.h w/lib/regex_internal.h
-index 859832f..3c7fe06 100644
---- i/lib/regex_internal.h
-+++ w/lib/regex_internal.h
-@@ -826,7 +826,8 @@ re_string_wchar_at (const re_string_t *pstr, Idx idx)
-
- static int
- internal_function __attribute ((pure))
--re_string_elem_size_at (const re_string_t *pstr, Idx idx)
-+re_string_elem_size_at (const re_string_t *pstr _UNUSED_PARAMETER_,
-+			Idx idx _UNUSED_PARAMETER_)
- {
- # ifdef _LIBC
-   const unsigned char *p, *extra;

gnulib

@@ -1 +1 @@
-Subproject commit f782c0f66728e636e98214c33e55de063f00f113
+Subproject commit db9cad7b8b59a010ff9158513a29cb002a2b8ae1