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devdraw: printmesg: implement "z" fmt arg (safe since printmesg is disabled)

--- a/sys/src/9/port/devdraw.c

+++ b/sys/src/9/port/devdraw.c

@@ -1383,6 +1383,10 @@

 			q += sprint(q, " %.4ux", BGSHORT(a));

 			a += 2;

 			break;

+		case 'z':

+			q += sprint(q, " %.*q", (int)*a, (char*)(a+1));

+			a += 1 + *a;

+			break;

 		}

 	}

 	*q++ = '\n';