Fix removing empty directories

Reported by Thomas Moschny <thomas.moschny@gmx.de>:
src/patch.c (main): Temporary output files are created in the same directory as
the output file.  Make sure to remove them before removing empty files and
their empty ancestor directories; else the directories won't be empty.
tests/remove-directories: Add directory removal test case.
tests/Makefile.am (TESTS): Add new test case.

src/patch.c

@@ -646,8 +646,8 @@ main (int argc, char **argv)
     if (outstate.ofp && (ferror (outstate.ofp) || fclose (outstate.ofp) != 0))
       write_fatal ();
     output_files (NULL);
-    delete_files ();
     cleanup ();
+    delete_files ();
     if (somefailed)
       exit (1);
     return 0;

tests/Makefile.am

@@ -50,6 +50,7 @@ TESTS = \
 	reject-format \
 	remember-backup-files \
 	remember-reject-files \
+	remove-directories \
 	symlinks \
 	unmodified-files
 

tests/remove-directories

@@ -0,0 +1,29 @@
+# Copyright (C) 2013 Free Software Foundation, Inc.
+#
+# Copying and distribution of this file, with or without modification,
+# in any medium, are permitted without royalty provided the copyright
+# notice and this notice are preserved.
+
+. $srcdir/test-lib.sh
+
+require_cat
+use_local_patch
+use_tmpdir
+
+# ==============================================================
+# Remove empty parent diectories when removing a file
+
+mkdir dir
+echo foobar > dir/file
+cat > apatch <<EOF
+--- dir/file
++++ /dev/null
+@@ -1 +0,0 @@
+-foobar
+EOF
+
+check 'patch -p0 -E < apatch' <<EOF
+patching file dir/file
+EOF
+
+ncheck '! test -e dir'