proj: Patch test OPEN_MAX limit assumption

One of the tests had a Linux-based assumption on the number of files
that can be opened. I have submitted this patch upstream here,
OSGeo/PROJ#2934, and it's been merged but I
don't expect to be able to update to a release before ZHF ends.

ZHF: NixOS#144627

Fixes NixOS#142875

pkgs/development/libraries/proj/default.nix

@@ -1,6 +1,7 @@
 { lib
 , stdenv
 , fetchFromGitHub
+, fetchpatch
 , cmake
 , pkg-config
 , sqlite
@@ -20,6 +21,12 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-Z2nruyowC3NG4Wb8AFBL0PME/zp9D7SwQdMSl6VjH/w=";
   };
 
+  patches = [ (fetchpatch {
+      url = "https://github.com/OSGeo/PROJ/commit/ac113a8898cded7f5359f1edd3abc17a78eee9b4.patch";
+      sha256 = "0gz2xa5nxzck5c0yr7cspv3kw4cz3fxb2yic76w7qfvxidi7z1s1";
+    })
+  ];
+
   outputs = [ "out" "dev"];
 
   nativeBuildInputs = [ cmake pkg-config ];