config: sync with binutils-gdb

For the files that are in both trees (config/enable.m4 and
config/lib-prefix.m4) pull in Matthieu's:

commit c22e3e25de0aa7841c4ef7c6b9e167b5685c2671
Author:     Matthieu Longo <matthieu.longo@arm.com>
AuthorDate: Tue May 28 10:49:40 2024 +0100
Commit:     Alan Modra <amodra@gmail.com>
CommitDate: Mon Jun 10 08:25:55 2024 +0930

    autoupdate: replace obsolete macros AC_HELP_STRING

    - AC_HELP_STRING by AS_HELP_STRING
      https://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.72/autoconf.html#index-AC_005fHELP_005fSTRING-1
    Except for the ifdef in lib-prefix.m4, make the defun of AC_LIB_ARG_WITH
    unconditional.

For config/tcl.m4 bring in the changes from:

commit 095037e241aaeb8baa41842a75d8e5df73d2e51d
Author:     Patrick Monnerat <patrick@monnerat.net>
AuthorDate: Tue Mar 31 16:44:44 2026 +0200
Commit:     Patrick Monnerat <patrick@monnerat.net>
CommitDate: Thu Apr 2 17:00:30 2026 +0200

    Support MinGW & 64-bit libraries/paths in Tcl autoconf scripts

    Debian implements directories /usr/lib32 and /usr/lib64, but installs
    tclConfig.sh and tkConfig.sh in /usr/lib. Therefore always search in
    /usr/lib when the others fail.

    Most of these changes were originally submitted by Keith Seitz for
    Insight support.

    This commit also strips trailing spaces and normalizes tab/space
    indenting in config/tcl.m4.

config/enable.m4 was updated in both trees.  The change in
binutils-gdb also quoted the first argument to AS_HELP_STRING and is a
no-op.  Bring that to GCC.

The changes to config/lib-prefix.m4 and config/tcl.m4 are also a no-op
for the GCC tree.

There are no changes to the generated files.

config/ChangeLog:

	* enable.m4: Sync with binutils.
	* lib-prefix.m4: Likewise.
	* tcl.m4: Likewise.

Signed-off-by: Pietro Monteiro <pietro@sociotechnical.xyz>