* Makefile.in: Add make ifeq define for hppa linux tasking support.
	* system-hpux.ads: Define Signed_Zeros to be True.
	* system-linux-hppa.ads, s-osinte-linux-hppa.ads: New files.

Co-Authored-By: John David Anglin <dave.anglin@nrc-cnrc.gc.ca>

From-SVN: r97796