libglvnd, ocl-icd, vulkan-loader: Remove addOpenGLRunpath where not needed.

For APIs that use driver config files, the config files should point to libraries using absolute paths, so `RUNPATH` should be unnecessary. It is still needed for `libGLX` because that does not use config files but the dispatch library receives just a vendor name from the X server.

pkgs/development/libraries/vulkan-loader/default.nix

@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
     sha256 = "0zhrwj1gi90x2w8gaaaw5h4b969a8gfy244kn0drrplhhb1nqz3b";
   };
 
-  nativeBuildInputs = [ pkgconfig addOpenGLRunpath ];
+  nativeBuildInputs = [ pkgconfig ];
   buildInputs = [ cmake python3 xlibsWrapper libxcb libXrandr libXext wayland ];
   enableParallelBuilding = true;
 
@@ -30,12 +30,6 @@ stdenv.mkDerivation rec {
 
   outputs = [ "out" "dev" ];
 
-  # Set RUNPATH so that driver libraries in /run/opengl-driver(-32)/lib can be found.
-  # See the explanation in addOpenGLRunpath.
-  postFixup = ''
-    addOpenGLRunpath $out/lib/libvulkan.so
-  '';
-
   meta = with stdenv.lib; {
     description = "LunarG Vulkan loader";
     homepage    = https://www.lunarg.com;