Makefile.in (extraclean): Delete.

Makefile.in (extraclean): Delete.

gcc:
	* Makefile.in (extraclean): Delete.
	* configure.in (target_list): Remove extraclean.
	* configure: Regenerate.
	* doc/makefile.texi, doc/sourcebuild.texi: Update.
	* objc/Make-lang.in (objc.extraclean): Delete.

gcc/ada:
	* Make-lang.in (ada.extraclean): Delete.

gcc/cp:
	* Make-lang.in (c++.extraclean): Delete.

gcc/f:
	* Make-lang.in (f77.extraclean): Delete.

gcc/java:
	* Make-lang.in (java.extraclean): Delete.

gcc/treelang:
	* Make-lang.in (treelang.extraclean): Delete.

From-SVN: r73759