[Android] Build with -O2

[Edward Wang]

On 13-01-12 02:22 AM, Rafaël Carré <funman at videolan.org> wrote:
> Not really, -O2 was already used within VLC as it is automake default.
We didn't use it because it was automake default, rather we used it 
because we forced it in configure.sh:

CFLAGS="-g -O2 -fstrict-aliasing -funsafe-math-optimizations"

Regards,
         Edward Wang