t-osf5: Remove.

t-osf5: Remove.

	gcc:
	* config/alpha/t-osf5: Remove.
	* config/alpha/t-osf-pthread: Remove.
	* config.gcc (alpha*-dec-osf5.1*): Set tmake_file to t-slibgcc-dummy.
	* mkmap-flat.awk: Handle osf_export for Tru64 UNIX linker -input file.

	libgcc:
	* configure.ac (target_thread_file): Determine thread model.
	* configure: Regenerate.
	* config.host (alpha*-dec-osf5.1*): Set tmake_file, extra_parts.
	* config/alpha/t-alpha: New file.
	* config/alpha/t-crtfm: Use $<.
	* config/alpha/t-ieee: New file.
	* config/alpha/t-osf-pthread: New file.
	* config/alpha/t-slibgcc-osf: New file.
	* config/alpha/libgcc-osf5.ver: New file.

From-SVN: r174603