[libchamplain] Revert "meson: add meson build system"

[Jiří Techet <jiritechet src gnome org>]

commit 4388b40747ee6d8b09bdd502b0ddd95a864b481a
Author: Jiří Techet <techet gmail com>
Date:   Fri Jul 13 11:06:57 2018 +0200

    Revert "meson: add meson build system"
    
    Commit by mistake.
    
    This reverts commit 5c9f0a1c7ccdc77e1a1436d7689ada55b5d83a33.

 champlain-gtk/meson.build      |  91 ------------------
 champlain/meson.build          | 205 -----------------------------------------
 demos/meson.build              |  59 ------------
 docs/meson.build               |   4 -
 docs/reference-gtk/meson.build |  26 ------
 docs/reference/meson.build     |  39 --------
 meson.build                    |  76 ---------------
 meson_options.txt              |   4 -
 8 files changed, 504 deletions(-)