[mutter] Bump version to 40.alpha

[Florian Müllner <fmuellner src gnome org>]

commit ea179ed8d4769890286809ba298c7ecca112018e
Author: Florian Müllner <fmuellner gnome org>
Date:   Mon Oct 5 15:24:30 2020 +0200

    Bump version to 40.alpha
    
    The GNOME project has adopted a new versioning scheme[0], and
    GNOME 3.38 will be followed by GNOME 40.
    
    Open the new development cycle by switching to the new scheme, as
    well as to post-release bumps as recommended.
    
    [0] https://discourse.gnome.org/t/new-gnome-versioning-scheme/4235
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1473

 meson.build | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/meson.build b/meson.build
index 46a5d522a3..1204218f77 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,5 @@
 project('mutter', 'c',
-  version: '3.38.1',
+  version: '40.alpha',
   meson_version: '>= 0.51.0',
   license: 'GPLv2+'
 )
@@ -8,7 +8,7 @@ split_version = meson.project_version().split('.')
 
 # Automatically increase API version each development cycle,
 # starting with 0 in 3.23.x
-api_version = (split_version[1].to_int() - 23) / 2
+api_version = split_version[0].to_int() - 32
 libmutter_api_version = '@0@'.format(api_version)
 
 # generic version requirements