libaom: defer RTCD header generation to cmake

We only need to format the files generated by cmake.
This causes no change to the current configuration.
This facilitates upcoming changes to the generator.

Bug: 783519
Change-Id: If8e51f082881728c46a8ee9924db5d2c3ac13d11
Reviewed-on: https://chromium-review.googlesource.com/1132267
Reviewed-by: Johann Koenig <johannkoenig@google.com>
Commit-Queue: Johann Koenig <johannkoenig@google.com>
Cr-Commit-Position: refs/heads/master@{#574208}
1 file changed