rpc: add $(SASL_CFLAGS) to libvirt_net_rpc_server_la_CFLAGS

The files for libvirt-net-rpc-server.la refernce the sasl/sasl.h
system header but never used the $(SASL_CFLAGS) variable. This
was never noticed previously because the $(AVAHI_CLFAGS) were
set and these typically pulled in the same include directory.

When mDNS/Avahi support was removed this exposed the bug which
caused FreeBSD builds to break as /usr/local/include was no
longer searched for headers.
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

src/rpc/Makefile.inc.am

@@ -111,6 +111,7 @@ libvirt_net_rpc_server_la_SOURCES = \
 libvirt_net_rpc_server_la_CFLAGS = \
 	$(DBUS_CFLAGS) \
 	$(XDR_CFLAGS) \
+	$(SASL_CFLAGS) \
 	$(AM_CFLAGS) \
 	$(NULL)
 libvirt_net_rpc_server_la_LDFLAGS = \