[gtk-doc] Remove redundant acinclude.m4

[Stefan Kost <stefkost src gnome org>]

commit 61ac18fbe8cc1c976e8eaca96dd31bbaf8fb1518
Author: Ryan Lortie <desrt desrt ca>
Date:   Sun Dec 29 00:35:27 2013 -0500

    Remove redundant acinclude.m4
    
    This file contains only copies of the files from m4/ and should not be
    in version control.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=721228

 acinclude.m4 |   55 -------------------------------------------------------
 1 files changed, 0 insertions(+), 55 deletions(-)