[libgda] Fix GDA VAPI generation

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 2f57d5812f12643b19ceaeb493831b86da23dbbd
Author: Daniel Espinosa <esodan gmail com>
Date:   Fri May 18 21:17:52 2018 -0500

    Fix GDA VAPI generation

 libgda/Makefile.am | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/libgda/Makefile.am b/libgda/Makefile.am
index 675ef40d5..c697c4461 100644
--- a/libgda/Makefile.am
+++ b/libgda/Makefile.am
@@ -380,7 +380,7 @@ libgda-6.0.deps:
 libgda-6.0.vapi: Gda-6.0.gir
        $(VAPIGEN) --metadatadir=$(top_srcdir)/libgda --library libgda-6.0 --pkg libxml-2.0 Gda-6.0.gir
 
-vapidir = $(VAPIDIR)
+vapidir = $(datadir)/vala/vapi
 vapi_DATA=libgda-6.0.vapi libgda-6.0.deps
 
 EXTRA_DIST += \