Fix build on Ubuntu.

When building on Ubuntu with make -j3 (or more), it would always
fail when trying to build virt-aa-helper.  I'm not an expert in
automake by any means, but I think the entry for virt-aa-helper
is mis-using LDADD; it shouldn't be putting direct paths to
libvirt_conf.la and libvirt_util.la, but instead referencing those
names.  With this patch in place, I'm able to successfully build
on Ubuntu 9.04 with make -j3.
Signed-off-by: NChris Lalancette <clalance@redhat.com>

src/Makefile.am

@@ -1005,9 +1005,9 @@ virt_aa_helper_LDFLAGS = $(WARN_CFLAGS)
 virt_aa_helper_LDADD =						\
 		$(WARN_CFLAGS)					\
 		$(LIBXML_LIBS)					\
-		@top_srcdir@/src/libvirt_conf.la		\
-		@top_srcdir@/src/libvirt_util.la		\
-		@top_srcdir@/gnulib/lib/libgnu.la
+		libvirt_conf.la					\
+		libvirt_util.la					\
+		../gnulib/lib/libgnu.la
 virt_aa_helper_CFLAGS =						\
 		-I@top_srcdir@/src/conf				\
 		-I@top_srcdir@/src/security