Remove all ARM CPU feature detection

We were no longer using the CRC32 feature, and we never actually used
any of the others, either. All 64-bit ARM CPUs support the features we
actually want to use. Developers targeting 32-bit ARM can choose to
enable NEON for the whole library (or do multiple builds, which is
perhaps common?).

Change-Id: I2a02b521858e7fc450881ceabe25d2de590b13d4
Reviewed-by: Ben Wagner <>
Commit-Queue: Brian Osman <>
4 files changed