Add removing of libdfp-test-ulps.h
Add removing of libdfp-test-ulps.h

Makefile misses that and thus make clean make distclean do not clean everything
properly

gftg85/libdfp,gftg85/libdfp,pmur/libdfp,gftg85/libdfp,pmur/libdfp,pmur/libdfp,pmur/libdfp,gftg85/libdfp