[gdk-pixbuf] build: Don't require shared-mime-info on macOS

[Christoph Reiter <creiter src gnome org>]

commit 4c63e6fea6ceda96af72c9931d49c7c002c6607b
Author: Christoph Reiter <creiter src gnome org>
Date:   Fri Aug 11 18:56:54 2017 +0200

    build: Don't require shared-mime-info on macOS
    
    Since commit 2c2162c86d4f710007cfffbc582a1f0ce8740725 shared-mime-info
    is required for building gdk-pixbuf, except on Windows. This disables
    it on macOS as well to restore the old behaviour.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=786167

 configure.ac |    3 +++
 meson.build  |    4 ++--
 2 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 712cddd..76c8adb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -116,6 +116,9 @@ case "$host" in
       ;;
     esac
     ;;
+  *-*-darwin*)
+    gio_can_sniff=no
+    ;;
   *)
     os_win32=no
     ;;
diff --git a/meson.build b/meson.build
index fd6ea9a..1691b08 100644
--- a/meson.build
+++ b/meson.build
@@ -193,8 +193,8 @@ gobject_dep = dependency('gobject-2.0', version: glib_req_version)
 gmodule_dep = dependency('gmodule-no-export-2.0')
 gio_dep = dependency('gio-2.0')
 
-# On non-Windows systems we always required shared-mime-info and GIO
-if host_machine.system() != 'windows'
+# On non-Windows/macOS systems we always required shared-mime-info and GIO
+if host_system != 'windows' and host_system != 'darwin'
   shared_mime_dep = dependency('shared-mime-info')
   gdk_pixbuf_conf.set('GDK_PIXBUF_USE_GIO_MIME', 1)
 else