Updates the //mojo snapshotted code and the mojo SDK to
0a98559b4, which includes several cleanups in the GL headers.
Also adds /sky/packages/sky_services/lib to .gitignore
This updates to mojo commit d259eb58aa59 and limits the roll script to
only pull in the parts of //mojo that are currently being used. More
stuff will be dropped in the future.
