fixed compiler warnings under Solaris 2.7

config.c

@@ -24,6 +24,7 @@
 #include <pwd.h>
 #include <sys/types.h>
 #include <string.h>
+#include <stdlib.h>
 #include "isync.h"
 
 static config_t *box = 0;

imap.c

@@ -222,6 +222,9 @@ socket_perror (const char *func, Socket_t *sock, int ret)
 	}
 	return;
     }
+#else
+    (void) sock;
+    (void) ret;
 #endif
     perror (func);
 }