top level: make more dependencies explicit

[Andrew Cagney]

> Is the setting of SHELL the only problem with using Makefile.in as a
> Makefile?  It looks like none of the others matter, in which case I'd
> like to bring them back.

``Looks like'' isn't sufficient :-)  The commands:
	gmake -f Makefile.in gdb+dejagnu.tar
	gmake -f Makefile.in insight+dejagnu.tar
and some equivalent for binutils, need to work (I'm not sure what 
BINUTILS uses, ask DanielJ).

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Andrew