Add missing include

git-svn-id: http://subversion.jackaudio.org/jack/jack2/trunk/jackmp@2347 0c269be4-1314-0410-8aa9-9f06e86f4224

example-clients/control.c

@@ -8,6 +8,7 @@
 #include <errno.h>
 #include <stdlib.h>
 #include <string.h>
+#include <signal.h>
 #include <math.h>
 #include <jack/jack.h>
 

example-clients/metro.c

@@ -21,6 +21,7 @@
 #include <errno.h>
 #include <unistd.h>
 #include <math.h>
+#include <signal.h>
 #include <getopt.h>
 #include <string.h>
 

example-clients/midiseq.c

@@ -19,6 +19,7 @@
 #include <jack/jack.h>
 #include <jack/midiport.h>
 #include <stdio.h>
+#include <signal.h>
 #include <stdlib.h>
 #include <unistd.h>
 

example-clients/midisine.c

@@ -21,6 +21,7 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
+#include <signal.h>
 #include <math.h>
 
 #include <jack/jack.h>