[llvm] [cmake] Use current directory in GenerateVersionFromVCS

Find dependent scripts of GenerateVersionFromVCS in current directory
rather than ../../cmake/modules.  I do not see any reason why the former
would not work and The latter is incorrect when GenerateVersionFromVCS
is used from install directory (i.e. in stand-alone builds).

Differential Revision: https://reviews.llvm.org/D57996

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353674 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed