PC-BSD/trueos 51cab7ctools/build/mk OptionalObsoleteFiles.inc

Fix OptionalObsoleteFiles copy/paste mistake from r345236, which
connected libomp to the build.  The comparison should not have been
against ${MK_OPENSSH}, but against ${MK_OPENMP}, obviously.

MFC after:      3 days
DeltaFile
+1-1tools/build/mk/OptionalObsoleteFiles.inc
+1-11 files

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