[Ada] "doc" and "dvi" target for makefile

[Rainer Orth]

Florian Weimer <fw@deneb.enyo.de> writes:

> Here's the updated version of the patch, after Rainer's changes have
> been merged.

Great, thanks.  Would something like this be appropriate for the branch,
too?  Building and installing the GNAT manuals there would certainly be
beneficial.

> Index: gcc/ada/Make-lang.in
> ===================================================================
> RCS file: /cvs/gcc/egcs/gcc/ada/Make-lang.in,v
> retrieving revision 1.10
> diff -c -r1.10 Make-lang.in

> ! # Generate documentation.
> ! #
> ! # The generated Texinfo files for the User Guideare stored in
						    ^ missing blank

	Rainer