[atk] build: remove autotools configuration files

[Alejandro Piñeiro Iglesias <apinheiro src gnome org>]

commit 173f8530aeea2a68f839c49b905cf35df357f795
Author: Alejandro Piñeiro <apinheiro igalia com>
Date:   Tue Apr 17 09:28:00 2018 +0200

    build: remove autotools configuration files
    
    Meson is right now in a really good shape, so it doesn't make sense to
    keep both.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=795315

 Makefile.am       |   28 ------
 README            |   24 ++----
 atk/Makefile.am   |  252 ---------------------------------------------------
 autogen.sh        |   38 --------
 configure.ac      |  260 -----------------------------------------------------
 docs/Makefile.am  |   46 ----------
 po/Makevars       |   78 ----------------
 tests/Makefile.am |   31 -------
 8 files changed, 8 insertions(+), 749 deletions(-)
---
diff --git a/README b/README
index 92f19bd..4461bde 100644
--- a/README
+++ b/README
@@ -26,28 +26,20 @@ You can also clone the ATK master branch from GNOME repository:
 Building
 --------
 
-To buid ATK from a release tarball you can use Autotools:
-
-    $ ./configure
-    $ make
-    # make install
-
-Alternatively, you can use Meson and Ninja:
+You can use Meson and Ninja:
 
     $ meson _build .
     $ ninja -C _build
     # ninja -C _build install
 
-To build ATK from a Git clone using Autotools, run the autogen.sh script
-instead of the configure one; before running autogen.sh or configure, make
-sure you have libtool in your path. If you use Meson, no changes are
-necessary.
+Tarball
+-------
+
+If you want a tarball with the ATK source code, you can also use
+Meson:
 
-Note that autogen.sh runs the configure script for you. If you wish to pass
-options like --prefix=/usr to configure you can give those options to
-autogen.sh and they will be passed on to configure; if you wish to run
-autogen.sh without running the configure script, export the NOCONFIGURE
-environment variable.
+  $ meson _build .
+  $ ninja -C _build dist
 
 How to report bugs
 ------------------