Allow users of Skia to optionally link against X11 and GL on Linux.

Change-Id: Id46986c0c7865d1877766e1584550e0b9e1af6c2
Reviewed-on: https://skia-review.googlesource.com/154803
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed