configure.ac: Sync liboil check with plugins-base.

Original commit message from CVS:
* configure.ac:
Sync liboil check with plugins-base.

ChangeLog

+2007-07-23  Stefan Kost  <ensonic@users.sf.net>
+
+	* configure.ac:
+	  Sync liboil check with plugins-base.
+
 2007-07-20  Stefan Kost  <ensonic@users.sf.net>
 
 	* ext/annodex/Makefile.am:

configure.ac

@@ -253,9 +253,9 @@ dnl GLib is required
 AG_GST_GLIB_CHECK([2.6])
 
 dnl liboil is required
-PKG_CHECK_MODULES(LIBOIL, liboil-0.3 >= 0.3.2, HAVE_LIBOIL=yes, HAVE_LIBOIL=no)
+PKG_CHECK_MODULES(LIBOIL, liboil-0.3 >= 0.3.8, HAVE_LIBOIL=yes, HAVE_LIBOIL=no)
 if test "x${HAVE_LIBOIL}" != xyes ; then
-  AC_ERROR([liboil-0.3 is required])
+  AC_ERROR([liboil-0.3.8 or later is required])
 fi
 
 dnl checks for gstreamer