maint: update gnulib to latest

Run 'make update-gnulib-to-latest' - thus pulling in 357 commits,
including the following which was also discussed in:
  https://savannah.gnu.org/bugs/?60383
  > test-framework-sh: remove unsafe entries from PATH

* gnulib: Update to latest.
* cfg.mk (local-checks-to-skip): Add and therefore disable sc_indent
as auto indent is too invasive for now.
* m4/mkinstalldirs.m4: Fix repeated word: s/can can/can/.  Reported by
a new rule in sc_prohibit_doubled_word.
* m4/noreturn.m4: Likewise.
* tests/init.sh: Likewise.

cfg.mk

@@ -23,7 +23,7 @@ local-checks-to-skip :=
 
 # Errors I think are too picky anyway.
 local-checks-to-skip += sc_error_message_period sc_error_message_uppercase \
-	sc_file_system
+	sc_file_system sc_indent
 
 exclude_file_name_regexp--sc_obsolete_symbols = build-aux/src-sniff\.py
 exclude_file_name_regexp--sc_space_tab = \

gnulib

@@ -1 +1 @@
-Subproject commit 7cc8d8aa0db12119d6d88af430238c24361afc4e
+Subproject commit d50912b6c60732476bb2955d947bacb73aaa2d59

m4/mkinstalldirs.m4

@@ -3,7 +3,7 @@ dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 dnl
-dnl This file can can be used in projects which are not available under
+dnl This file can be used in projects which are not available under
 dnl the GNU General Public License or the GNU Library General Public
 dnl License but which still want to provide support for the GNU gettext
 dnl functionality.

m4/noreturn.m4

@@ -3,7 +3,7 @@ dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 dnl
-dnl This file can can be used in projects which are not available under
+dnl This file can be used in projects which are not available under
 dnl the GNU General Public License or the GNU Library General Public
 dnl License but which still want to provide support for the GNU gettext
 dnl functionality.

tests/init.sh

@@ -426,6 +426,23 @@ setup_ ()
   for sig_ in 1 2 3 13 15; do
     eval "trap 'Exit $(expr $sig_ + 128)' $sig_"
   done
+
+  # Remove relative and non-accessible directories from PATH, including '.'
+  # and Zero-length entries.
+  saved_IFS="$IFS"
+  IFS=:
+  new_PATH=
+  sep_=
+  for dir in $PATH; do
+    case "$dir" in
+      /*) test -d "$dir/." || continue
+          new_PATH="${new_PATH}${sep_}${dir}"
+          sep_=':';;
+    esac
+  done
+  IFS="$saved_IFS"
+  PATH="$new_PATH"
+  export PATH
 }
 
 # This is a stub function that is run upon trap (upon regular exit and