Disable libquadmath and libatomic

commit 4d595fcf52188aa3b6342be4ff93b626e5f9e9c6
Author: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>
Date:   Sun Aug 7 22:52:05 2011 +0159

    Disable libquadmath for the time being, Android doesn't need it
    and it doesn't compile without further tweaking

commit d2e47df90be24f5cdb72123508421ddffde43f61
Author: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>
Date:   Sat May 12 03:53:29 2012 +0200

    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>