[gimp/meson] Added shmem-type option

[Félix Piédallu <fpiedallu src gnome org>]

commit 3a21e576ca501c803d4ba20141447c0687c58f4f
Author: Félix Piédallu <felix piedallu me>
Date:   Tue Feb 13 16:35:32 2018 +0100

    Added shmem-type option

 meson_options.txt |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/meson_options.txt b/meson_options.txt
index fea8e6f..4269354 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -29,3 +29,5 @@ option('with-wmf',          type: 'boolean', value: true)
 option('with-xmc',          type: 'boolean', value: true)
 option('with-xpm',          type: 'boolean', value: true)
 option('with-xvfb-run',     type: 'boolean', value: true)
+option('shmem-type',        type: 'combo',   value: 'auto',
+        choices: [ 'none', 'sysv', 'posix', 'win32', 'auto' ])