Remove headers for CL, EGL, GLES2, KHR, VG

In chromium we should never use these headers from mesa. We use the
OpenGL ES 2.0 and KHR headers from khronos. Having duplicates in the
tree is confusing and a recipe for disaster if the two ever diverge and
different versions are used by different libraries, especially since they
all use the same include guard so which version is seen by a particular
target depends on the include path order.

Original review on https://codereview.chromium.org/479683003/

Review URL: https://codereview.chromium.org/608893002

git-svn-id: svn://svn.chromium.org/chrome/trunk/deps/third_party/mesa@292163 0039d316-1c4b-4281-b951-d872f2087c98
19 files changed