[libgda] Use the installed introspection.m4

[Vivien Malerba <vivien src gnome org>]

commit cf28e6251914126cfa6538f66862bd5a419ff33d
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Oct 31 11:54:14 2012 +0100

    Use the installed introspection.m4

 configure.ac        |    1 -
 m4/introspection.m4 |  103 ---------------------------------------------------
 2 files changed, 0 insertions(+), 104 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index b8cded8..559cc89 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4,7 +4,6 @@ m4_define(micro, 2)
 m4_define([gda_stable],
 	m4_if(m4_eval(minor % 2), [0], [yes], [no]))
 AC_CONFIG_MACRO_DIR([m4])
-m4_include(m4/introspection.m4)
 m4_include(m4/vapigen.m4)
 m4_include(m4/dk-warn.m4)
 m4_include(m4/mdbtools.m4)