Remove a duplicate entry for libgpib_p.a.

Reviewed by:	emaste
Sponsored by:	The University of Cambridge, Google Inc.
Differential Revision:	https://reviews.freebsd.org/D33850

ObsoleteFiles.inc

@@ -11362,7 +11362,6 @@ OLD_FILES+=usr/lib/libgpib.a
 OLD_FILES+=usr/lib/libgpib_p.a
 OLD_FILES+=usr/lib/libgpib.so
 OLD_LIBS+=usr/lib/libgpib.so.3
-OLD_FILES+=usr/lib/libgpib_p.a
 OLD_FILES+=usr/lib32/libgpib.a
 OLD_FILES+=usr/lib32/libgpib_p.a
 OLD_FILES+=usr/lib32/libgpib.so