[pygoocanvas] Fix the build when using libtool 2.x

[Gian Mario Tagliaretti <gianmt src gnome org>]

commit 61fd54b190fbb89953cc4fdbb12c0389ec3d08c3
Author: Gian Mario Tagliaretti <gianmt gnome org>
Date:   Mon Apr 27 19:52:26 2009 +0200

    Fix the build when using libtool 2.x
---
 configure.ac |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/configure.ac b/configure.ac
index 85c20ce..82856f0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -56,6 +56,10 @@ AC_DISABLE_STATIC
 AC_LIBTOOL_WIN32_DLL
 AC_PROG_LIBTOOL
 
+dnl when using libtool 2.x create libtool early, because it's used in configure
+m4_ifdef([LT_OUTPUT], [LT_OUTPUT]) 
+AM_PROG_CC_C_O
+
 AM_PATH_PYTHON(2.2)
 
 AM_CHECK_PYTHON_HEADERS(,[AC_MSG_ERROR(could not find Python headers)])