Many of our GLES and EGL headers had old SGI licenses which tripped up
Android's license detection.

Bug: None
Change-Id: Iede9a72b3619fdd77ba21895fc5a76a81f0a5790
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2643489Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>