toolchain/build: Use --disable-libatomic for gcc

libatomic can't currently be built for Android, breaking
the gcc trunk (4.8) build process.

Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>

Conflicts:
	Makefile.in
Disable tui for GDB for versions >=7.2

Change-Id: Ia183372141ef3c593d31627a4d714d4d2656e11f
Update arm-androideabi script

Change-Id: I38813f08797e3f7bee62b4ac099726a3c9f053ba