[gnome-disk-utility] build: Use a string for include directory

[Kai Lüke <kailueke src gnome org>]

commit 7185cf6a975a63d38860dd9d04d15371ae9ed42f
Author: Iñigo Martínez <inigomartinez gmail com>
Date:   Thu Jul 4 08:35:59 2019 +0200

    build: Use a string for include directory
    
    since meson 0.50, `include_directories` also accepts strings[0] that
    helps simplifying in some cases.
    
    The include directory on the `libgdu` dependency has been replaced
    by a string taking advantage of this feature.
    
    [0] http://mesonbuild.com/Release-notes-for-0-50-0.html#include_directories-accepts-a-string

 src/libgdu/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/libgdu/meson.build b/src/libgdu/meson.build
index 7e097078..36bd128b 100644
--- a/src/libgdu/meson.build
+++ b/src/libgdu/meson.build
@@ -39,6 +39,6 @@ libgdu = static_library(
 libgdu_dep = declare_dependency(
   sources: enum_sources[1],
   link_with: libgdu,
-  include_directories: include_directories('.'),
+  include_directories: '.',
   dependencies: deps,
 )