MFC r348677 (by emaste):

MFC r348677 (by emaste):

move llvm-ar and llvm-nm to appropriate location in OptionalObsoleteFiles.inc

After r348610 `make delete-old` was still removing llvm-ar and llvm-nm
(and associated man pages).

Reported by:	jhb
Sponsored by:	The FreeBSD Foundation

MFC r348761 (by jkim):

Move llvm-ranlib to appropriate location in OptionalObsoleteFiles.inc.

Note llvm-ar is linked to llvm-ranlib since r311565.  r348677 fixed
"make delete-old" issue with llvm-ar but missed it somehow.

Discussed with:	emaste, jhb