[aravis] build: update introspection m4 file.

[Emmanuel Pacaud <emmanuel src gnome org>]

commit f7a6d3f8c6674d4cbb028dd8248469d8d4110b09
Author: Emmanuel Pacaud <emmanuel gnome org>
Date:   Mon May 7 10:13:21 2012 +0200

    build: update introspection m4 file.

 m4/introspection.m4 |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/m4/introspection.m4 b/m4/introspection.m4
index 589721c..d89c3d9 100644
--- a/m4/introspection.m4
+++ b/m4/introspection.m4
@@ -41,6 +41,8 @@ m4_define([_GOBJECT_INTROSPECTION_CHECK_INTERNAL],
     ],dnl
     [auto],[dnl
         PKG_CHECK_EXISTS([gobject-introspection-1.0 >= $1], found_introspection=yes, found_introspection=no)
+	dnl Canonicalize enable_introspection
+	enable_introspection=$found_introspection
     ],dnl
     [dnl	
         AC_MSG_ERROR([invalid argument passed to --enable-introspection, should be one of @<:@no/auto/yes@:>@])