PC-BSD/trueos 13b1c7a. Makefile.inc1

Clean stale wpa dependencies and objects after r341759

The wpa update added some source files with the same name as a file in
another directory (found via .PATH in the previous version).  Having a
stale entry in a .depend file means the new file won't be built, so test
for this case and if found remove all of wpa's dependency files.

MFC with:       r341759
Sponsored by:   The FreeBSD Foundation
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+8-0Makefile.inc1
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