[libpeas/wip/hadess/fix-libpeas-gtk-pc-includedir] build: Fix includedir in libpeas-gtk pkgconfig Cflags

[Bastien Nocera <hadess src gnome org>]

commit ac4f70ec52e08bdbf9e594d6112f2d0bb02e40eb
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Aug 6 12:15:47 2019 +0200

    build: Fix includedir in libpeas-gtk pkgconfig Cflags
    
    It should say:
    $ grep Cflags meson-private/libpeas-gtk-1.0.pc
    Cflags: -I${includedir}/libpeas-1.0/libpeas-gtk
    
    Not:
    $ grep Cflags meson-private/libpeas-gtk-1.0.pc
    Cflags: -I${includedir}/libpeas-gtk-1.0
    
    As there are no headers installed in ${includedir}/libpeas-gtk-1.0

 libpeas-gtk/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/libpeas-gtk/meson.build b/libpeas-gtk/meson.build
index 2f099f7..5de50b4 100644
--- a/libpeas-gtk/meson.build
+++ b/libpeas-gtk/meson.build
@@ -116,6 +116,6 @@ libpeas_gtk_pc = pkg.generate(
   libpeas_gtk_sha,
   name: package_gtk_string,
   description: 'GObject plugins library widgetery',
-  subdirs: package_gtk_string,
+  subdirs: join_paths(package_string, package_gtk_name),
   install_dir: pkgconfigdir,
 )