[libgfbgraph] m4: Removed unnecessary m4 files

[Álvaro Peña <alvaropg src gnome org>]

commit 191e5387bdfca42000c6550819d2f91c5119cf47
Author: Álvaro Peña <alvaropg gmail com>
Date:   Tue Jan 5 17:15:25 2016 +0100

    m4: Removed unnecessary m4 files
    
    https://bugzilla.gnome.org/show_bug.cgi?id=760108

 m4/libtool.m4     | 8372 -----------------------------------------------------
 m4/ltoptions.m4   |  437 ---
 m4/ltsugar.m4     |  123 -
 m4/ltversion.m4   |   23 -
 m4/lt~obsolete.m4 |   98 -
 5 files changed, 0 insertions(+), 9053 deletions(-)