PATCH: PR gdb/10649: GDB_DATADIR_PATH is used, but never defined

[Joel Brobecker]

> >     PR gdb/10649
> >     * Makefile.in (GDB_DATADIR_PATH): Renamed to ...
> >     (GDB_DATADIR): This.
> >     (xml-syscall-install): Updated.
>
> Joel, I think it's critical that this goes into the release branch.
> 
> Otherwise, "make install" creates a directory called
> @GDB_DATADIR_PATH@ in the install tree.

Patch installed on the branch. (Doug, I trust your judgement, so if you
think a patch should be applied to the branch, please just do so and
explain why - If I happen to disagree, we it's easy to revert it).

-- 
Joel