Backport of one CI build fix

Author: NWilson

maint/PrepareRelease

@@ -32,7 +32,7 @@
 
 # Set the LANG to C, because nroff converts ASCII "HYPHEN-MINUS" to Unicode
 # "HYPHEN" if the system is using a UTF-8 locale (like "C.UTF-8").
-export LANG=C
+export LANG=C LC_ALL=C
 
 # Extract the current release version from configure.ac.
 CURRENT_RELEASE=`grep -E 'm4_define\(pcre2_(major|minor|prerelease)' configure.ac | \

maint/RunManifestTest

@@ -3,8 +3,10 @@
 # Script to test a directory listing. We use this to verify that the list of
 # files installed by "make install" or "cmake --install" matches what we expect.
 
-LANG=C # Ensure stable ordering of `sort` output
-export LANG
+# Ensure stable ordering of `sort` output
+LANG=C
+LC_ALL=C
+export LANG LC_ALL
 
 if [ "$1" = "" -o "$2" = "" ] ; then
     echo "Usage: $0 <dir> <manifest name>" >&2