[gobject-introspection] meson: fix default cairo DLL name on Windows

[Christoph Reiter <creiter src gnome org>]

commit 7c2781c44a06b7e695dd225a106359208793c271
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Sat Apr 20 20:07:57 2019 +0200

    meson: fix default cairo DLL name on Windows
    
    host_machine.system() returns "windows" on Windows

 gir/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gir/meson.build b/gir/meson.build
index 85ae575d..c77ee6dd 100644
--- a/gir/meson.build
+++ b/gir/meson.build
@@ -1,7 +1,7 @@
 cairo_conf = configuration_data()
 if get_option('cairo_libname') != ''
   cairo_library_name = get_option('cairo_libname')
-elif host_machine.system() == 'win32'
+elif host_machine.system() == 'windows'
   cairo_library_name = 'libcairo-gobject-2.dll'
 elif host_machine.system() == 'darwin'
   cairo_library_name = 'libcairo-gobject.2.dylib'