Disable some Thumb CFLAGS:

When -Os was removed in this change https://github.com/SaberMod/android_build/commit/5109a012337cac5664cb688ca44f01e43f5be9ae
Some flags that were needed to be disabled for thumbs was removed.
This causes stability problems and needs to be added back.  Flags
were taken from GNU documentation for what -Os disables:
http://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html

Signed-off-by: Paul Beeler <sparksco@gmail.com>