config.build (alpha*-dec-osf4*): Remove.

config.build (alpha*-dec-osf4*): Remove.

	gcc:
	* config.build (alpha*-dec-osf4*): Remove.
	* config.gcc: Remove alpha*-dec-osf4*, alpha-dec-osf5.0* from list
	of obsolete configurations.
	(alpha*-dec-osf[45]*): Remove alpha*-dec-osf4*, alpha-dec-osf5.0*
	support.
	* config/alpha/t-osf4: Renamed to ...
	* config/alpha/t-osf5: ... this.
	* config/alpha/osf.h: Renamed to ...
	* config/alpha/osf5.h: ... this.
	Merged old osf5.h contents.
	Update comments.
	(ASM_SPEC): Use ASM_OLDAS_SPEC directly.
	(EXTRA_SPECS): Removed.
	* doc/install.texi (Specific, alpha*-dec-osf5.1): Renamed to
	reflect removal of Tru64 UNIX V4.0/V5.0 support.
	Document that.

	fixincludes:
	* inclhack.def (alpha_wchar): Remove.
	* fixincl.x: Regenerate.
	* tests/base/wchar.h: Remove.

	libgcc:
	* config.host (alpha*-dec-osf[45]*): Removed alpha*-dec-osf4*,
	alpha-dec-osf5.0* support.

From-SVN: r158235