[libsoup] Add --disable-vala to DISTCHECK_CONFIGURE_FLAGS

[Dan Winship <danw src gnome org>]

commit 6e69ec421c8f8f0d209936b6506429a8d978eb11
Author: Dan Winship <danw gnome org>
Date:   Mon May 1 19:36:00 2017 -0400

    Add --disable-vala to DISTCHECK_CONFIGURE_FLAGS
    
    Distcheck is failing now because VAPIDIR gets set to
    /usr/share/vala/vapi and it tries to install things into there when
    distchecking... Not sure what changed.

 Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index fc0f93d..38d2872 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -15,7 +15,7 @@ EXTRA_DIST =                          \
        Makefile.glib                   \
        config.h.win32
 
-DISTCHECK_CONFIGURE_FLAGS = --enable-gtk-doc --enable-introspection
+DISTCHECK_CONFIGURE_FLAGS = --enable-gtk-doc --enable-introspection --disable-vala
 
 pkgconfigdir = $(libdir)/pkgconfig