gatling: fix build with gcc14

Cause of the error was actually a main without return type is a
probe program, causing the probes to fail.

pkgs/by-name/ga/gatling/package.nix

@@ -30,8 +30,10 @@ stdenv.mkDerivation rec {
   ];
 
   configurePhase = ''
-    substituteInPlace Makefile --replace "/usr/local" "$out"
-    substituteInPlace GNUmakefile --replace "/opt/diet" "$out"
+    substituteInPlace Makefile --replace-fail "/usr/local" "$out"
+    substituteInPlace GNUmakefile --replace-fail "/opt/diet" "$out"
+    substituteInPlace tryalloca.c --replace-fail "main() {" "int main() {"
+    substituteInPlace trysocket.c --replace-fail "main() {" "int main() {"
   '';
 
   buildPhase = ''