Don't enable the inlines when building libm itself. Otherwise clang gets
upset by seeing both an inline and a non-inline definition.
This reverts commit c5deb0f883cbdca7e5ab75f92f82c31d21367f49.
Change-Id: If7abdb351f5a5549d6a331b33af408e8fcfa9868
Use of "extern inline" breaks clang build.
This reverts commit d76f16973a9d06765fb1f482239b9559f893ffd0.
Change-Id: I995d0d38c3776f5c50b060f16770741c92a2acac