[wing] With meson 0.50 is an error give the full path to the installation

[Ignacio Casal Quinteiro <icq src gnome org>]

commit 8b86b65d6d87ad7b18607bb74ba596e84f665efc
Author: guruDanny67 <daniele forghieri gmail com>
Date:   Mon Mar 11 22:28:53 2019 +0100

    With meson 0.50 is an error give the full path to the installation

 meson.build | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/meson.build b/meson.build
index 6d65b28..816aa60 100644
--- a/meson.build
+++ b/meson.build
@@ -36,8 +36,7 @@ libversion = '@0@.@1@.@2@'.format(soversion, current, revision)
 wing_prefix = get_option('prefix')
 wing_libdir = join_paths(wing_prefix, get_option('libdir'))
 wing_includedir = join_paths(wing_prefix, get_option('includedir'))
-wing_includedir_real = join_paths(wing_includedir,
-                                  wing_api_name,
+wing_includedir_real = join_paths(wing_api_name,
                                   meson.project_name())
 wing_datadir = join_paths(wing_prefix, get_option('datadir'))