build: add LIBNL_CFLAGS to build of libvirt_lxc

When libvirt_lxc is built, it uses the utility library and #includes
virnetdev.h, which #includes virnetlink.h, which includes
<netlink/msg.h>.

Normally, the netlink include directory would be just off
/usr/include, so that wouldn't create a problem, but on Fedora and
RHEL systems using libnl3, the libnl includes have been moved into
/usr/include/libnl3 (to allow concurrent installation of libnl-1.1).

All other binaries that need it have added $(LIBNL_CFLAGS) to their
CFLAGS, but not libvirt_lxc, so it fails to build on Fedora and RHEL
that have only libnl3-devel installed. This was previously unnoticed
because everyone was building with libnl headers in
/usr/include/netlink (even on systems with the headers in
/usr/include/libnl3/netlink, many people (like me) usually also have
the libnl1.1 headers in /usr/include/netlink).

This patch adds the necessary CFLAGS for libvirt_lxc.

Note that we don't need to add $(LIBNL_LIBS) to the LDADD for this
binary, because it never directly calls libnl functions, but only
calls them indirectly through the util library, which it's already
linking against.

src/Makefile.am

@@ -1650,7 +1650,8 @@ libvirt_lxc_LDADD += $(APPARMOR_LIBS)
 endif
 libvirt_lxc_CFLAGS =				\
 		-I$(top_srcdir)/src/conf	\
-		$(AM_CFLAGS)
+		$(AM_CFLAGS)                    \
+		$(LIBNL_CFLAGS)
 if HAVE_LIBBLKID
 libvirt_lxc_CFLAGS += $(BLKID_CFLAGS)
 libvirt_lxc_LDADD += $(BLKID_LIBS)