Without this patch, 'ld' as invoked by 'g-ir-scanner' fails to find -lgudev-1.0
This is because libtool puts it in $(top_builddir)/.libs.

This patch forces 'g-ir-scanner' to use libtool, which enables it to find
libgudev-1.0.la.

--- udev-182/Makefile.in	2014-06-22 14:55:07.000000000 +0200
+++ udev-182/Makefile.in	2014-06-22 14:55:15.000000000 +0200
@@ -3622,7 +3622,7 @@ test-sys-distclean:
 @ENABLE_GUDEV_TRUE@@ENABLE_INTROSPECTION_TRUE@		--namespace GUdev \
 @ENABLE_GUDEV_TRUE@@ENABLE_INTROSPECTION_TRUE@		--nsversion=1.0 \
 @ENABLE_GUDEV_TRUE@@ENABLE_INTROSPECTION_TRUE@		--include=GObject-2.0 \
-@ENABLE_GUDEV_TRUE@@ENABLE_INTROSPECTION_TRUE@		--library=gudev-1.0 \
+@ENABLE_GUDEV_TRUE@@ENABLE_INTROSPECTION_TRUE@		--library=gudev-1.0 --libtool=$(top_builddir)/libtool \
 @ENABLE_GUDEV_TRUE@@ENABLE_INTROSPECTION_TRUE@		--library-path=$(top_builddir)/src \
 @ENABLE_GUDEV_TRUE@@ENABLE_INTROSPECTION_TRUE@		--library-path=$(top_builddir)/src/gudev \
 @ENABLE_GUDEV_TRUE@@ENABLE_INTROSPECTION_TRUE@		--output $@ \
