Add (guix elf).

* guix/elf.scm: New file.  Taken from Guile 'master', commit 3f826e3.
* Makefile.am (MODULES): Add it.
* THANKS: Thank Andy, who wrote this module.

Makefile.am

@@ -56,6 +56,7 @@ MODULES =					\
   guix/ftp-client.scm				\
   guix/http-client.scm				\
   guix/gnupg.scm				\
+  guix/elf.scm					\
   guix/store.scm				\
   guix/svn-download.scm				\
   guix/ui.scm					\

THANKS

@@ -31,6 +31,7 @@ infrastructure help:
 	    Benno Schulenberg <coordinator@translationproject.org>
 	     Alen Skondro <askondro@gmail.com>
 	 Matthias Wachs <wachs@net.in.tum.de>
+             Andy Wingo <wingo@pobox.com>
            Philip Woods <elzairthesorcerer@gmail.com>
 
 GNU Guix also includes non-software works.  Thanks to the following