Add missing headers for modern toolchains

src/dmail/dmail.c

@@ -35,6 +35,7 @@ extern int errno;		/* just in case */
 #include <sys/stat.h>
 #include "c-client.h"
 #include "dquota.h"
+#include <ctype.h>
 
 
 /* Globals */

src/mlock/mlock.c

@@ -40,6 +40,8 @@
 #include <netdb.h>
 #include <ctype.h>
 #include <string.h>
+#include <unistd.h>   /* write, read, close, link, unlink, chdir, sleep, getpid, gethostname */
+#include <time.h>     /* time */
 
 #define LOCKTIMEOUT 5		/* lock timeout in minutes */
 #define LOCKPROTECTION 0664

src/tmail/tmail.c

@@ -35,6 +35,7 @@ extern int errno;		/* just in case */
 #include <sys/stat.h>
 #include "c-client.h"
 #include "tquota.h"
+#include <ctype.h>
 
 
 /* Globals */