Compile qemu-nbd also on OpenBSD and Solaris

basename() needs #include <libgen.h>.

No prototype for daemon() is available on Solaris, but link
succeeds.
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

configure

@@ -2141,7 +2141,7 @@ esac
 tools=
 if test `expr "$target_list" : ".*softmmu.*"` != 0 ; then
   tools="qemu-img\$(EXESUF) qemu-io\$(EXESUF) $tools"
-  if [ "$linux" = "yes" ] ; then
+  if [ "$linux" = "yes" -o "$bsd" = "yes" -o "$solaris" = "yes" ] ; then
       tools="qemu-nbd\$(EXESUF) $tools"
     if [ "$check_utests" = "yes" ]; then
       tools="check-qint check-qstring check-qdict check-qlist $tools"

qemu-nbd.c

@@ -30,6 +30,7 @@
 #include <netinet/tcp.h>
 #include <arpa/inet.h>
 #include <signal.h>
+#include <libgen.h>
 
 #define SOCKET_PATH    "/var/lock/qemu-nbd-%s"