rtcd.pl: check for auto_help availability
'auto_help' was added to Getopt::Long in 2.33
this isn't strictly necessary as an unrecognized option (--help) will
issue a warning and then print the usage
Change-Id: Ia757553a4e19d22a8eb70768a8866ab1a76a0eec
diff --git a/build/make/rtcd.pl b/build/make/rtcd.pl
index f5f59b1..295443c 100755
--- a/build/make/rtcd.pl
+++ b/build/make/rtcd.pl
@@ -3,7 +3,7 @@
no strict 'refs';
use warnings;
use Getopt::Long;
-Getopt::Long::Configure("auto_help");
+Getopt::Long::Configure("auto_help") if $Getopt::Long::VERSION > 2.32;
my %ALL_FUNCS = ();
my @ALL_ARCHS;
