cpp.texi: Include gcc-common.texi.

cpp.texi: Include gcc-common.texi.

	* doc/cpp.texi: Include gcc-common.texi.  Don't define gcctabopt
	macro locally.  Don't give last revision date.  Use GCC version
	number from gcc-common.texi.
	* doc/cppinternals.texi: Include gcc-common.texi.  Don't give last
	revision date.  Use GCC version number from gcc-common.texi.
	Describe being a library as current state rather than as 3.x
	history.
	* doc/gcc.texi: Remove last update date.
	* doc/gccint.texi: Likewise.  Update copyright dates.
	* doc/install.texi: Update copyright dates.

fortran:
	* gfortran.texi: Don't give last update date.

java:
	* gcj.texi: Update copyright dates.

treelang:
	* treelang.texi: Don't use local treelang version number.  Don't
	give last update date.

From-SVN: r94683