Treat test sources that do not contain instrinsics normally.
Treat test sources that do not contain instrinsics normally.

Files that contain a simd flavor in their name are only instrinsics
sources when the simd flavor is the suffix of the basename.

BUG=aomedia:657

Change-Id: I87d47c77750730171817f38fe3877226e7c09c10

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom