Build libgtest.a and libopenh264.a when doing "make test" for iOS
Fix a typo, setttings -> settings
Remove a misleading comment

This comment claimed to be a completely different file.
Use a more descriptive include guard in the welsEncoder/DecoderExt.h files
Merge pull request #940 from mstorsjo/minor-cleanup

Minor cleanups
Merge pull request #944 from mstorsjo/ios-test

Build libgtest.a and libopenh264.a when doing "make test" for iOS