libdpkg: Link unit tests with libcompat and libintl

Because the unit tests might end up pulling arbitrary libdpkg modules,
we need to link to these libraries in case they are needed on the
system.

debian/changelog

@@ -5,6 +5,8 @@ dpkg (1.16.2) UNRELEASED; urgency=low
     use the configured features and compat code.
   * Honour --disable-nls when the system lacks obstack support, by updating
     the obstack compat module from gnulib.
+  * Link the libdpkg unit tests with libcompat and libintl, so that systems
+    needing them will compile correctly.
 
   [ Updated man page translations ]
   * German (Helge Kreutzmann).

lib/dpkg/test/Makefile.am

@@ -5,7 +5,10 @@ AM_CPPFLAGS = \
 	-idirafter $(top_srcdir)/lib/compat \
 	-I$(top_builddir) \
 	-I$(top_srcdir)/lib
-LDADD = ../libdpkg.a
+LDADD = \
+	$(top_builddir)/lib/dpkg/libdpkg.a \
+	$(top_builddir)/lib/compat/libcompat.a \
+	$(LIBINTL)
 
 
 # The tests are sorted in order of increasing complexity.