objc.texi: Move from ../libobjc/objc-features.texi.

gcc:
	* objc.texi: Move from ../libobjc/objc-features.texi.  Adjust for
	inclusion as a chapter of the GCC manual.
	* gcc.texi: Include objc.texi.
	* fdl.texi: Use @unnumberedsec for the addendum.
	* Makefile.in ($(srcdir)/gcc.info, gcc.dvi): Update dependencies.

libobjc:
	* objc-features.texi: Move to ../gcc/objc.texi.
	* fdl.texi: Remove.
	* Makefile.in: Don't generate documentation from
	objc-features.texi.

From-SVN: r41927