In android-ndk10c, there is a "arm_neon.h" for all archs. The arm_neon.h for
x86* contains correspondence between neon and sse. In speexdsp, There is a
conflict between resample_sse.h and resample_neon.h. So disable neon if arch is
known to don't have neon.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>