[aravis] build: make configure work even without GOBJECT_INTROSPECTION_CHECK.

[Emmanuel Pacaud <emmanuel src gnome org>]

commit 6ee517b06766a87e765430aa0e0321d8157f9aa8
Author: Emmanuel Pacaud <emmanuel gnome org>
Date:   Tue Nov 5 08:39:58 2013 +0100

    build: make configure work even without GOBJECT_INTROSPECTION_CHECK.

 configure.ac |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 60b3a6b..11557b9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -126,7 +126,14 @@ AC_SUBST(GST_PLUGIN_LDFLAGS)
 
 AC_PATH_PROG(GLIB_MKENUMS, glib-mkenums)
 
+m4_ifdef([GOBJECT_INTROSPECTION_CHECK], [
 GOBJECT_INTROSPECTION_CHECK([0.10.0])
+], [
+   AM_CONDITIONAL([HAVE_INTROSPECTION], [false])
+   enable_introspection=no])
+
+GOBJECT_INTROSPECTION_CHECK([0.10.0])
+
 GTK_DOC_CHECK([1.14],[--flavour no-tmpl])
 AM_CONDITIONAL([BUILD_GTK_DOC], [test "x$enable_gtk_doc" = "xyes" || test ! -f "autogen.sh"])