Android: Use grammar files from SPIRV-Headers repo
Android: Use grammar files from SPIRV-Headers repo

The locations of the headers and grammar files have
moved.  Also the names of the grammar files have changed.

antiagainst/shaderc,dneto0/shaderc,fuchsia-mirror/third_party-shaderc,dneto0/shaderc,dneto0/shaderc,fuchsia-mirror/third_party-shaderc,antiagainst/shaderc,dneto0/shaderc,fuchsia-mirror/third_party-shaderc,antiagainst/shaderc,antiagainst/shaderc