[librsvg/librsvg-2.40] Fix generating Vala bindings in non-srcdir builds

[Emmanuele Bassi <ebassi src gnome org>]

commit 366b0d8185464c86e069e100c55fd8bd7718f7e1
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Fri Dec 15 11:45:38 2017 +0000

    Fix generating Vala bindings in non-srcdir builds
    
    The location of the files vapigen uses must be relative to the source
    and build directories, otherwise they will not be found.
    
    This fixes the librsvg build in Continuous, which is failing with the
    error:
    
    /usr/bin/vapigen-0.40  --library librsvg-2.0 --metadatadir .. --pkg gio-2.0 --pkg cairo Rsvg-2.0.gir 
Rsvg-2.0-custom.vala
    error: Rsvg-2.0-custom.vala not found
    Generation failed: 1 error(s), 0 warning(s)
    
    Signed-off-by: Emmanuele Bassi <ebassi gnome org>

 Makefile.am | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index f89d7ba..52b2d83 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -261,8 +261,8 @@ librsvg-$(RSVG_API_VERSION).vapi: Rsvg-$(RSVG_API_VERSION).gir
 VAPIGEN_VAPIS = librsvg-$(RSVG_API_VERSION).vapi
 
 librsvg_@RSVG_API_VERSION_U@_vapi_DEPS = gio-2.0 cairo
-librsvg_@RSVG_API_VERSION_U@_vapi_METADATADIRS = $(srcdir)
-librsvg_@RSVG_API_VERSION_U@_vapi_FILES = Rsvg-$(RSVG_API_VERSION).gir Rsvg-$(RSVG_API_VERSION)-custom.vala
+librsvg_@RSVG_API_VERSION_U@_vapi_METADATADIRS = $(top_srcdir)
+librsvg_@RSVG_API_VERSION_U@_vapi_FILES = $(top_builddir)/Rsvg-$(RSVG_API_VERSION).gir 
$(top_srcdir)/Rsvg-$(RSVG_API_VERSION)-custom.vala
 
 vapidir = $(datadir)/vala/vapi
 vapi_DATA = $(VAPIGEN_VAPIS)