Moved extern declarations to private header file, they are only used from...

Moved extern declarations to private header file, they are only used from within libomptarget, they don't need to be in omptarget.h.



git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@327740 91177308-0d34-0410-b5e6-96231b3b80d8