ninja: fix 404'ing patch

Kyndig on IRC noticed that building `ninja` from source would fail due
to a patch 404'ing (because the repo appears to no longer exist). Fetch
from upstream instead.

(cherry picked from commit 91d4e9a)
cc #85742

pkgs/development/tools/build-managers/ninja/default.nix

@@ -21,10 +21,9 @@ stdenv.mkDerivation rec {
       sha256 = "0zsg46jflsh644jccrcgyfalr7fkzrv041kyi8644nyk923gcrl9";
     })
     # https://github.com/ninja-build/ninja/issues/1510 - fix w/musl, possibly BSDs?
-    # 
     (fetchpatch {
       name = "fix-issue-1510.patch";
-      url = https://github.com/makepost/ninja/commit/567815df38a2ff54ad7478a90bd75c91e434236a.patch;
+      url = "https://github.com/ninja-build/ninja/commit/567815df38a2ff54ad7478a90bd75c91e434236a.patch";
       sha256 = "0zd0xyi7h2066nw1dsk76c7yf71b0f7v4p5nljda7jxi01vpdh69";
     })
   ];