binutils: doc: remove binutils_TEXINFOS usages

binutils: doc: remove binutils_TEXINFOS usages

This variable doesn't exist (it evaluates to nothing).

It was introduced in

    commit 42ecbf5edab08ee88b37d9fbd8542f5f25ce51ae
    Author: Daniel Jacobowitz <drow@false.org>
    Date:   Sun May 15 18:19:45 2005 +0000

And removed in

    commit c428fa83c21769fafedcebb7b4a381c6ca24f998
    Author: H.J. Lu <hjl.tools@gmail.com>
    Date:   Thu Mar 15 14:17:20 2007 +0000

Note: with my automake 1,15.1 (built from source), I get a spurious diff
in Makefile.in, where the

  runstatedir = @runstatedir@

line gets removed.  I am not sure why, but I haven't included it.

binutils/ChangeLog:

	* doc/Makefile.am: Remove references to binutils_TEXINFOS.
	* doc/Makefile.in: Re-generate.