ocl-icd: update platforms, remove outdated postPatch (#137342)

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

pkgs/development/libraries/ocl-icd/default.nix

@@ -25,14 +25,10 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ opencl-headers ];
 
-  postPatch = ''
-    sed -i 's,"/etc/OpenCL/vendors","${addOpenGLRunpath.driverLink}/etc/OpenCL/vendors",g' ocl_icd_loader.c
-  '';
-
   meta = with lib; {
     description = "OpenCL ICD Loader for ${opencl-headers.name}";
     homepage    = "https://github.com/OCL-dev/ocl-icd";
     license     = licenses.bsd2;
-    platforms = platforms.linux;
+    platforms = platforms.unix;
   };
 }