[libsecret/wip/nielsdg/drop-autotools] Drop autotools-based build

[Niels De Graef <nielsdg src gnome org>]

commit 458e1974120c7bdc7df4b2234227e0701810f6fa
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Sat Dec 28 18:58:13 2019 +0100

    Drop autotools-based build
    
    Our official instructions only tell how to build with Meson, our CI is
    only done with Meson and I wouldn't be surprised if most developers only
    used Meson as well.
    
    In other words, the autotools build is outdated. Let's say our goodbye
    and drop it in the next stable release.

 Makefile.am                          | 196 -----------------
 autogen.sh                           | 116 ----------
 build/Makefile.redirect              |   9 -
 build/gcrypt.supp                    |  12 --
 build/glib.supp                      | 335 -----------------------------
 build/m4/vapigen.m4                  |  96 ---------
 build/pthread.supp                   |   7 -
 build/tap-gtester                    |   5 -
 build/tap-unittest                   |  84 --------
 build/unknown.supp                   | 391 ----------------------------------
 configure.ac                         | 307 ---------------------------
 docs/man/Makefile.am                 |  15 --
 docs/reference/libsecret/Makefile.am | 109 ----------
 libsecret/Makefile.am                | 401 -----------------------------------
 libsecret/libsecret-unstable.pc.in   |  13 --
 libsecret/libsecret.pc.in            |  15 --
 tool/Makefile.am                     |  11 -
 17 files changed, 2122 deletions(-)