Enable libgomp and update build script

Change-Id: I22151c58c58f6b74d1d74371ee6f20c2cd00a6e0
Revert "toolchain/build: Use --disable-libatomic for gcc"

This reverts commit 12fdb1eabab3a1d9d883a7d908f179a9c951224e.
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
Update

Change-Id: I9c6e5e0150c79c885eabdce083d4b4e777cac240

Update build scripts

Change-Id: I3db02eb5fdf264f1bc155c672b32c36665153b3d