* ldmisc.c, ldmisc.h: Re-write info() to take a filename

	* ldmisc.c, ldmisc.h:  Re-write info() to take a filename
	parameter, a format, and an arg pointer, and rename it to
	vfinfo().  Write info() in terms of new vfinfo().
	New einfo() is the same as info(), except it writes to stderr.
	* ldemul.c, ldexp.c, ldlang.c, ldlnk960.c, ldmain.c, ldwrite.c,
	ldmisc.c:  Replace "error" calls to info() by new einfo().