[totem] build: Remove meson build file from docs directory

[Iñigo Martínez <inigomartinez src gnome org>]

commit c2986ff74c9250d9fce821987b83a773188722b2
Author: Iñigo Martínez <inigomartinez gmail com>
Date:   Fri Feb 16 12:49:23 2018 +0100

    build: Remove meson build file from docs directory
    
    The meson build file in `docs` directory is used only to include
    the `reference` directory.
    
    The file has been removed and the full `docs/reference` path is
    used from the root source directory.

 docs/meson.build |    1 -
 meson.build      |    2 +-
 2 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/meson.build b/meson.build
index 53cdd72..a639bdf 100644
--- a/meson.build
+++ b/meson.build
@@ -282,7 +282,7 @@ subdir('help')
 subdir('src')
 
 if get_option('enable-gtk-doc')
-  subdir('docs')
+  subdir('docs/reference')
 endif
 
 meson.add_install_script('meson_post_install.py')