* config/sol2.h (LINK_ARCH32_SPEC): Define in terms of ...
	(LINK_ARCH32_SPEC_BASE): ... this new macro.
	* config/sparc/sol2-bi.h (LINK_ARCH64_SPEC): Define in terms of
	...
	(LINK_ARCH64_SPEC_BASE): ... this new macro.
	* config/sparc/sol2-gld-bi.h (LINK_ARCH32_SPEC): New macro.
	(LINK_ARCH64_SPEC): Likewise.

From-SVN: r74793