wireguard-tools: drag in headers for prototypes

ipc.c and terminal.c provide definitions for prototypes in their
respective headers, drag those in.

Signed-off-by: Kyle Evans <kevans@FreeBSD.org>

src/ipc.c

@@ -7,6 +7,7 @@
 #include <stdlib.h>
 #include <errno.h>
 #include "containers.h"
+#include "ipc.h"
 
 struct string_list {
 	char *buffer;

src/terminal.c

@@ -11,6 +11,7 @@
 #include <stdbool.h>
 #include <unistd.h>
 #include "ctype.h"
+#include "terminal.h"
 
 static bool color_mode(void)
 {