PC-BSD/trueos 00c7e0elib/libomp Makefile, tools/build/mk OptionalObsoleteFiles.inc

To avoid unnecessarily modifying ports, add a -lgomp symlink, since GCC
does not ship a -lomp symlink.  Also update OptionalObsoleteFiles for
this, and add 32-bit variants while here.

Submitted by:   jbeich
PR:             237975
MFC after:      3 days
DeltaFile
+7-0tools/build/mk/OptionalObsoleteFiles.inc
+2-0lib/libomp/Makefile
+9-02 files

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