[RFA] Makefile.tpl: Add maybe-configure-itcl to configure-gdb

[DJ Delorie]

> I do not have access to gcc.

I'll apply the patches when I see them.

> Aside: I presume the MAINTAINERS file needs to be updated so that it
> mentions Makefile.tpl and the real procedure for getting patches to
> it approved...

The "real procedure" has never been approved.  The sync only works
because there's enough people who happen to have the right privs in
the right projects to make it happen manually.