treewide: refactor to use libglvnd

* Implement libGL as a symlink package which uses libraries from libglvnd and
  headers from Mesa (since ones from libglvnd are outdated).
* Use libGL_driver.driverLink treewide; add FHS paths where possible.

pkgs/misc/emulators/caprice32/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, libpng, pkgconfig, SDL, freetype, zlib, mesa }:
+{ stdenv, fetchFromGitHub, libpng, pkgconfig, SDL, freetype, zlib }:
 
 stdenv.mkDerivation rec {
 

pkgs/misc/emulators/wine/base.nix

@@ -53,7 +53,7 @@ stdenv.mkDerivation ((lib.optionalAttrs (! isNull buildScript) {
   ++ lib.optionals openclSupport [ pkgs.opencl-headers pkgs.ocl-icd ]
   ++ lib.optionals xmlSupport    [ pkgs.libxml2 pkgs.libxslt ]
   ++ lib.optionals tlsSupport    [ pkgs.openssl pkgs.gnutls ]
-  ++ lib.optionals openglSupport [ pkgs.libGLU_combined pkgs.libGL.osmesa pkgs.libdrm ]
+  ++ lib.optionals openglSupport [ pkgs.libGLU_combined pkgs.mesa_noglu.osmesa pkgs.libdrm ]
   ++ (with pkgs.xorg; [
     libX11  libXi libXcursor libXrandr libXrender libXxf86vm libXcomposite libXext
   ])));