GLES/egl.h was unused.
EGL/egl.h is already used everywhere EGL is needed.

Change-Id: I1b8a6fc72a8eb9b63edfad73f29be6f8b1d210c1
Reviewed-on: https://swiftshader-review.googlesource.com/5851Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>