[vte/wip/sixels: 54/82] test-sixels: Include stdbool.h to permit using bool in C.

[Hans Petter Jansson <hansp src gnome org>]

commit ae9af9e1bf25d92346c76bba62a6ff7e425198be
Author: Hans Petter Jansson <hpj cl no>
Date:   Sat Jun 13 19:52:38 2020 +0200

    test-sixels: Include stdbool.h to permit using bool in C.

 src/test-sixels.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/test-sixels.c b/src/test-sixels.c
index 4812cf67..2eb7f59d 100644
--- a/src/test-sixels.c
+++ b/src/test-sixels.c
@@ -20,6 +20,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <stdint.h>
+#include <stdbool.h>
 #include <stdio.h>
 
 #include <termios.h>  /* TIOCGWINSZ */