Add a versioning system and tie it to the -v command-line option.  System is described in glslang/Include/revision.template.

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@24314 e7fa87d3-cd2b-0410-9028-fcbf551c1848