[Piglit] [ANNOUNCE] GLES and EGL tests have been merged into all.tests

[Chad Versace]

For Linux users
---------------
If you don't build the GLES and EGL tests, then piglit-run.py will skip them.

To ensure that the GLES tests get ran, run Piglit atop EGL. Invoke piglit-run.py
as `./piglit-run.py --platform=x11_egl ...`.

If you run Piglit atop GLX, which is the default, then the GLES tests will likely
be skipped. To run the GLES2 tests, your
GLX must support GLX_EXT_create_context_profile_es2. To run the GLES1 and GLES2
tests, your GLX must support GLX_EXT_create_context_profile_es. If your GLX
does support those extensions, and the tests are still skipped, please report
it to me.


For Windows and MacOS users
---------------------------
You don't build the GLES and EGL tests, so nothing changes for you.


For Android users
-----------------
I'm still waiting for your patches.