[gnome-shell] Revert "build: Bump mutter API version"

[Florian Müllner <fmuellner src gnome org>]

commit 922d73a09b9b6f05911cafc39de4f2022f33895a
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Feb 21 17:54:06 2018 +0100

    Revert "build: Bump mutter API version"
    
    Mutter only bumped the API version after 3.27.91 was released, so
    don't require it for gnome-shell's 3.27.91 release.

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index ba87c411f..f5b08b8f9 100644
--- a/meson.build
+++ b/meson.build
@@ -6,7 +6,7 @@ project('gnome-shell', 'c',
 
 # We depend on a specific version of the libmutter API. The mutter variants of
 # the Cogl and Clutter libraries also use this API version.
-mutter_api_version = '2'
+mutter_api_version = '1'
 
 clutter_pc = 'mutter-clutter-' + mutter_api_version
 cogl_pc = 'mutter-cogl-' + mutter_api_version