* config.gcc (hppa*64*-*-hpux11*): Check gnu_ld.
	* config/pa/pa.h (MASK_GNU_LD): New.
	(TARGET_GNU_LD): New.
	(TARGET_SWITCHES): New gnu-ld & no-gnu-ld flags.
	* config/pa/pa64-hpux.h (LINK_SPEC): Set based
	on gnu-ld and MASK_GNU_LD.

From-SVN: r57792