Disable checks on configure as we don't need them at build-time

Index: pessulus-2.30.2/configure.ac
===================================================================
--- pessulus-2.30.2.orig/configure.ac	2010-06-22 20:06:50.771407131 +0200
+++ pessulus-2.30.2/configure.ac	2010-06-22 20:06:55.843413562 +0200
@@ -11,8 +11,6 @@
 dnl make sure we keep ACLOCAL_FLAGS around for maintainer builds to work
 AC_SUBST(ACLOCAL_AMFLAGS, "$ACLOCAL_FLAGS")
 
-PKG_CHECK_MODULES([PESSULUS], [pygtk-2.0 >= 2.13.0])
-
 GETTEXT_PACKAGE=pessulus
 AC_SUBST(GETTEXT_PACKAGE)
 AC_DEFINE_UNQUOTED(GETTEXT_PACKAGE, "$GETTEXT_PACKAGE", [Gettext package])