* Bump glslang port to 11.11.0
* Fix sha to match the one shown on the microsoft build server
* Fix portfile issues (at least for Windows)
* Potentially fix shaderc port
* update shaderc version
* shaderc appears to require Threads?
* change shaderc port version?
* fix local port-version
* Added custom usage as per PR suggestion!
* Updated glslang port tree version hash
