gnum4: Disable stack protector when using MinGW (#171828)

Co-authored-by: Sandro <sandro.jaeckel@gmail.com>

pkgs/development/tools/misc/gnum4/default.nix

@@ -16,7 +16,8 @@ stdenv.mkDerivation rec {
 
   doCheck = false;
 
-  configureFlags = [ "--with-syscmd-shell=${stdenv.shell}" ];
+  configureFlags = [ "--with-syscmd-shell=${stdenv.shell}" ]
+    ++ lib.optional stdenv.hostPlatform.isMinGW "CFLAGS=-fno-stack-protector";
 
   meta = {
     description = "GNU M4, a macro processor";