Update mips toolchain mipsel-linux-android-4.6

Update mips toolchain to account for fix in
https://android-review.googlesource.com/#/c/37797/ and
other enhancements in toolchain.git

Build instructions:

Cherry-pick the following (not yet merged at the time of this CL):
  https://android-review.googlesource.com/#/c/37730
  https://android-review.googlesource.com/#/c/37843

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-4.6
rm -rf $NDK/toolchains/mipsel-linux-android-4.6/prebuilt/linux-x86/sysroot
cp -a $NDK/toolchains/mipsel-linux-android-4.6/prebuilt/linux-x86/* $NDK/../prebuilts/gcc/linux-x86/mips/mipsel-linux-android-4.6

Change-Id: I95f50f12700d4516371723e922dde32d7aecda9c
136 files changed