Fix the install target and make vmcd compile on linux.

robots/vmcd/GNUmakefile.in

@@ -65,7 +65,6 @@ install: all
 ifeq ($(HAVE_MEZZANINE),yes)
 	-mkdir -p $(INSTALL_SBINDIR)
 	$(INSTALL_PROGRAM) vmc-client $(INSTALL_SBINDIR)/vmc-client
-	$(INSTALL_PROGRAM) vmcd $(INSTALL_SBINDIR)/vmcd
 else
 	-mkdir -p $(INSTALL_DIR)/opsdir/sbin
 	$(INSTALL_PROGRAM) vmcd $(INSTALL_DIR)/opsdir/sbin/vmcd

robots/vmcd/vmcd.c

@@ -140,6 +140,7 @@ static void siginfo(int sig)
 {
     got_siginfo = 1;
 }
+#endif
 
 static void dump_robot(struct robot_object *ro)
 {
@@ -229,7 +230,6 @@ static void dump_info(void)
     info(" Current frame:\n");
     dump_vision_list(&current_frame);
 }
-#endif
 
 static void usage(void)
 {