[devhelp] build: remove the Autotools build system

[Sébastien Wilmet <swilmet src gnome org>]

commit b6debb3be23ff6edee7469bde5f94365b6c98668
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Fri Mar 23 10:46:03 2018 +0100

    build: remove the Autotools build system
    
    Replaced by Meson.
    
    Thanks to Iñigo Martínez for the initial patch to port the build system
    to Meson.

 Makefile.am                      |   18 --
 autogen.sh                       |   38 ----
 configure.ac                     |  124 ------------
 data/Makefile.am                 |   55 ------
 data/icons/Makefile.am           |   45 -----
 data/libdevhelp-3.0.pc.in        |   12 --
 devhelp/Makefile.am              |  164 ----------------
 devhelp/dh-enum-types.c.template |   39 ----
 devhelp/dh-enum-types.h.template |   27 ---
 docs/Makefile.am                 |    3 -
 docs/reference/Makefile.am       |  100 ----------
 git.mk                           |  400 --------------------------------------
 help/Makefile.am                 |   12 --
 m4/.gitignore                    |    1 -
 plugins/Makefile.am              |    9 -
 plugins/gedit-plugin/Makefile.am |   14 --
 po/Makevars                      |   78 --------
 src/Makefile.am                  |   88 ---------
 unit-tests/Makefile.am           |   29 ---
 19 files changed, 0 insertions(+), 1256 deletions(-)