After having migrated piglit-dispatch to the Khronos XML,
moving GLES1 to piglit-dispatch was easy. This patch:

  1. Fixes gl_wrap.h to include piglit-dispatch-gen.h instead of
     <GLES/*.h>.
  2. Deletes some ugly macro workarounds for GLES1 that piglit-dispatch
     obsoletes.
  3. Add piglit-dispatch*.c to libpiglitutil_gles1 in the CMake.
  4. Call piglit_dispatch_init(PIGLIT_DISPATCH_ES1).

Signed-off-by: Chad Versace <chad.versace@linux.intel.com>