[libwnck] meson, libwnck: Don't use absolute path for headers subdir

[Marco Trevisan <marcotrevi src gnome org>]

commit afc25f8fada85cc3a3ac8156c7c20535119d7958
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Tue Apr 30 18:27:19 2019 -0500

    meson, libwnck: Don't use absolute path for headers subdir

 libwnck/meson.build | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/libwnck/meson.build b/libwnck/meson.build
index cb43cf7..0cd68fc 100644
--- a/libwnck/meson.build
+++ b/libwnck/meson.build
@@ -1,7 +1,6 @@
 gnome = import('gnome')
 
-libwnck_includepath = join_paths(includedir, PACKAGE_NAME)
-libwnck_includedir = join_paths(libwnck_includepath, meson.project_name())
+libwnck_includedir = join_paths(PACKAGE_NAME, meson.project_name())
 
 version_data = configuration_data()
 version_array = meson.project_version().split('.')
@@ -58,7 +57,7 @@ a11y_sources = [
 enum_types = gnome.mkenums_simple('wnck-enum-types',
   sources : headers,
   install_header: true,
-  install_dir: libwnck_includedir
+  install_dir: join_paths(includedir, libwnck_includedir)
 )
 
 resources = gnome.compile_resources(