Add mips toolchain mipsel-linux-android-4.8

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=mips
./build/tools/build-gcc.sh /tmp/ndk-$USER/src $NDK --gdb-version=7.3.x mipsel-linux-android-4.8 --try-64
rm -rf $NDK/toolchains/mipsel-linux-android-4.8/prebuilt/linux-x86_64/sysroot
cp -a $NDK/toolchains/mipsel-linux-android-4.8/prebuilt/linux-x86_64/* \
  $NDK/../prebuilts/gcc/linux-x86_64/mips/mipsel-linux-android-4.8

Change-Id: I5322aba2448b438e4e69130ab7521fee03059a5f
198 files changed