Discard new Bash LC_TYPE warning in RunGrepTest

Author: PhilipHazel

ChangeLog

@@ -78,6 +78,9 @@ __stdcall.
 20. A negative repeat value in a pcre2test subject line was not being 
 diagnosed, leading to infinite looping.
 
+21. Updated RunGrepTest to discard the warning that Bash now gives when setting 
+LC_CTYPE to an bad value (because older versions didn't).
+
 
 Version 10.40 15-April-2022
 ---------------------------

RunGrepTest

@@ -845,7 +845,12 @@ if [ $? -ne 0 ]; then
   echo "pcre2grep: Failed to set locale badlocale (obtained from LC_CTYPE)" >>testtrygrep
   echo "RC=2" >>testtrygrep
 else
-  (cd $srcdir; unset LC_ALL; LC_CTYPE=badlocale $valgrind $vjs $pcre2grep abc /dev/null) >>testtrygrep 2>&1
+
+# Bash has started giving a warning when LC_CTYPE is set to a bad value. In 
+# order to remain compatible with older versions, the following code is a bit
+# contorted.
+
+  (cd $srcdir; unset LC_ALL; export LC_CTYPE=badlocale 2>/dev/null; $valgrind $vjs $pcre2grep abc /dev/null) >>testtrygrep 2>&1
   echo "RC=$?" >>testtrygrep
 fi