Fixed Android.mk for Windows.
Fixed Android.mk for Windows.

Missing , in $(call host-cp) merged arguments on windows into broken
path.

cd - does not work on windows, replace with cd $(ROOT_SHADERC_PATH)

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