mesa/tests: add KHR_debug GLES glGetPointervKHR entry points

mesa/tests: add KHR_debug GLES glGetPointervKHR entry points

Should have been part of commit f53f9eb8d49 "glapi: add GetPointervKHR
to the ES dispatch".

v2: comment out the ES1.1 symbol and use the same description (pattern)
as elsewhere (Matt)

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93235
Fixes: f53f9eb8d49 "glapi: add GetPointervKHR to the ES dispatch".
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Tested-by: Vinson Lee <vlee@freedesktop.org> (v1)
Tested-by: Michel Dänzer <michel.daenzer@amd.com>