rxp: 1.5.0 -> 1.5.2

- switch `src` from debian mirror to upstream url because debian does
not have 1.5.2 version
- update to 1.5.2, fixing build with gcc14
- remove clang specific flags as errors were fixed in new version

Author: ghpzin

pkgs/by-name/rx/rxp/package.nix

@@ -6,15 +6,13 @@
 
 stdenv.mkDerivation rec {
   pname = "rxp";
-  version = "1.5.0";
+  version = "1.5.2";
 
   src = fetchurl {
-    url = "mirror://debian/pool/main/r/rxp/rxp_${version}.orig.tar.gz";
-    sha256 = "0y365r36wzj4xn1dzhb03spxljnrx8vwqbiwnnwz4630129gzpm6";
+    url = "https://www.inf.ed.ac.uk/research/isddarch/admin/rxp-${version}.tar.gz";
+    hash = "sha256-+mQbSlGF0KHZYQyCRbnVr/WXLBoooNqU8+ONafbBRRM=";
   };
 
-  env.NIX_CFLAGS_COMPILE = lib.optionalString stdenv.cc.isClang "-Wno-error=implicit-function-declaration -Wno-error=int-conversion";
-
   meta = {
     license = lib.licenses.gpl2Plus;
     description = "Validating XML parser written in C";