[libgda] Meson subproject: fix config.h location for gda-xslt

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 9c141db0a73cd6d22cac7a889390cd315c379ed4
Author: Daniel Espinosa <esodan gmail com>
Date:   Tue Apr 9 11:45:53 2019 -0500

    Meson subproject: fix config.h location for gda-xslt

 libgda-xslt/meson.build | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/libgda-xslt/meson.build b/libgda-xslt/meson.build
index a6e1c9863..186a0c3ff 100644
--- a/libgda-xslt/meson.build
+++ b/libgda-xslt/meson.build
@@ -28,8 +28,8 @@ libgda_xslt = library(
                        ],
        c_args: [
                '-include',
-               meson.build_root() + '/config.h',
+               join_paths(gda_top_build, 'config.h')
                ],
        link_with: libgda,
        install : true
-       )
\ No newline at end of file
+       )