Regexp modifier "r" needs perl 5.14; OpenSSL should build with 5.11, so do not use the "r" shortcut.

Reviewed-by: Hugo Landau <hlandau@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22019)

Configurations/50-win-hybridcrt.conf

@@ -11,7 +11,8 @@
 sub remove_from_flags {
     my ($toRemove, $flags) = @_;
     
-    return $flags =~ s/$toRemove//r;
+    $flags =~ s/$toRemove//;
+    return $flags;
 }
 
 my %targets = (