RELEASE-PREP: Remove obsolete EGCS reference.

RELEASE-PREP: Remove obsolete EGCS reference.

	* RELEASE-PREP: Remove obsolete EGCS reference.
	* g77.texi: Adjust reference to EGCS as something current.
	* lang-options.h (FTNOPT): Remove macro and obsolete comment.
	Include doc strings directly in option listing instead of through
	this macro.
	* root.texi: Remove support for multiple different (FSF and EGCS)
	distributions of g77.
	* g77install.texi: Remove conditioned out instructions applying
	only to obsolete distributions of g77 not as part of GCC.  Change
	"superceded" to the correct spelling "superseded".

From-SVN: r37766