Allow the build-toolchain.sh script to apply source packages.

All you need to do is place name them like the following:

   build/tools/toolchain-patches/<subpath>/<foo>.patch

And they will be applied with 'patch -p1' into:

   <build-src>/<subpath>

This is useful to experiment with toolchain changes without having
to regenerate a whole new source package tarball each time.
1 file changed