cpp.texi, [...]: Use @copying.

gcc:
	* doc/cpp.texi, doc/gcc.texi, doc/gccint.texi, doc/install.texi:
	Use @copying.

gcc/ada:
	* gnat_rm.texi, gnat_ug.texi: Use @copying.
	* gnat_ug_unx.texi, gnat_ug_vms.texi, gnat_ug_vxw.texi,
	gnat_ug_wnt.texi: Regenerate.

gcc/f:
	* g77.texi: Use @copying.

gcc/java:
	* gcj.texi: Use @copying.

gcc/treelang:
	* treelang.texi: Use @copying.

libstdc++-v3:
	* docs/html/17_intro/porting.texi: Use @copying.
	* docs/html/17_intro/porting.html: Regenerate.

From-SVN: r60587