qa/756: make "make" in perfevent dir fail properly
qa/756: make "make" in perfevent dir fail properly

If config out of whack and PMDA_PERFEVENT is false in builddefs,
then "make" was returning without error and without making the binary
we need.

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp