gty.texi: Remove instructions for adding a dependency on s-gtype.

gcc/
	* doc/gty.texi: Remove instructions for adding a dependency on s-gtype.
	* Makefile.in: Add code to compute some dependencies on s-gtype
	automatically.  Remove the declaration of those dependencies.
gcc/java/
	* Make-lang.in: Remove all dependencies on s-gtype, except for
	gt-java-parse.h.
gcc/objc/
	* Make-lang.in: Remove all dependencies on s-gtype.
gcc/objcp/
	* Make-lang.in: Remove all dependencies on s-gtype.
gcc/cp/
	* Make-lang.in: Remove all dependencies on s-gtype.
gcc/ada/
	* Make-lang.in: Remove all dependencies on s-gtype.
gcc/fortran/
	* Make-lang.in: Remove all dependencies on s-gtype, except for
	gt-fortran-trans.h.
gcc/treelang/
	* Make-lang.in: Remove all dependencies on s-gtype.

From-SVN: r108155