- enabled build of 'crocus' Gallium3D OpenGL driver for i965 "Gen4"

through Haswell "Gen7" graphics (alternative to classic "i965"
  OpenGL driver); use MESA_LOADER_DRIVER_OVERRIDE=crocus to use it;
  in case of issues with video hardware acceleration(vaapi driver),
  set LIBVA_DRIVER_NAME=i965

OBS-URL: https://build.opensuse.org/package/show/X11:XOrg/Mesa?expand=0&rev=1053

Mesa.spec

@@ -835,7 +835,7 @@ egl_platforms=x11,wayland
 %endif
   %ifarch %{ix86} x86_64
             -Ddri-drivers=i915,i965,nouveau,r100,r200 \
-            -Dgallium-drivers=r300,r600,radeonsi,nouveau,swrast,svga,virgl,iris \
+            -Dgallium-drivers=r300,r600,radeonsi,nouveau,swrast,svga,virgl,iris,crocus \
   %else
   %ifarch %{arm} aarch64
             -Ddri-drivers=nouveau \