New x86 toolchain i686-linux-android-4.6

Build instructions:

export NDK=your-AOSP-path/ndk
cd $NDK ; ./build/tools/dev-cleanup.sh
./build/tools/download-toolchain-sources.sh /tmp/ndk-$USER/src
./build/tools/gen-platforms.sh --minimal --dst-dir=$NDK --ndk-dir=$NDK --arch=x86
./build/tools/build-gcc.sh /tmp/ndk-$USER/src $NDK --gdb-version=7.3.x x86-4.6
rm -rf $NDK/toolchains/x86-4.6/prebuilt/linux-x86/sysroot
cp -a $NDK/toolchains/x86-4.6/prebuilt/linux-x86/* $NDK/../prebuilts/gcc/linux-x86/x86/i686-linux-android-4.6

Change-Id: Icba1c1e63f2269a99620e3ad44f87911e106bc4c
65 files changed