Fix missing syscons escape sequence for setting the border color.

sys/dev/syscons/scterm-teken.c

@@ -676,6 +676,11 @@ scteken_param(void *arg, int cmd, unsigned int value)
 	scr_stat *scp = arg;
 
 	switch (cmd) {
+	case TP_SETBORDER:
+		scp->border = value & 0xff;
+		if (scp == scp->sc->cur_scp)
+			sc_set_border(scp, scp->border);
+		break;
 	case TP_SHOWCURSOR:
 		if (value) {
 			sc_change_cursor_shape(scp,

sys/teken/sequences

@@ -101,6 +101,7 @@ TBC	Tab Clear				^[ [ g		r
 VPA	Vertical Position Absolute		^[ [ d		n
 
 # Cons25 compatibility sequences
+C25ADX	Cons25 set adapter border		^[ [ = A	r
 C25ADBG	Cons25 set adapter background		^[ [ = G	r
 C25ADFG	Cons25 set adapter foreground		^[ [ = F	r
 C25BLPD	Cons25 set bell pitch duration		^[ [ = B	r r

sys/teken/teken.h

@@ -101,6 +101,7 @@ typedef void tf_param_t(void *, int, unsigned int);
 #define	TP_SETBELLPD_PITCH(pd)		((pd) >> 16)
 #define	TP_SETBELLPD_DURATION(pd)	((pd) & 0xffff)
 #define	TP_MOUSE	6
+#define	TP_SETBORDER	7
 typedef void tf_respond_t(void *, const void *, size_t);
 
 typedef struct {

sys/teken/teken_subr_compat.h

@@ -26,6 +26,13 @@
  * $FreeBSD$
  */
 
+static void
+teken_subr_cons25_set_adapter_border(teken_t *t, unsigned int c)
+{
+
+	teken_funcs_param(t, TP_SETBORDER, c);
+}
+
 static void
 teken_subr_cons25_set_cursor_type(teken_t *t, unsigned int type)
 {