[OpenMP] Remove OMP spec versioning

Remove all older OMP spec versioning from the runtime and build system.

Patch by Terry Wilmarth

Differential Revision: https://reviews.llvm.org/D64534


git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@365963 91177308-0d34-0410-b5e6-96231b3b80d8
63 files changed