Removed unused build_openresty script. Use the one in the files branch instead.
Removed unused build_openresty script. Use the one in the files branch instead.

muymoo/staticfile-buildpack,sks/staticfile-buildpack,muymoo/staticfile-buildpack,sks/staticfile-buildpack,sks/staticfile-buildpack,muymoo/staticfile-buildpack,sks/staticfile-buildpack,muymoo/staticfile-buildpack