[vte/wip/sixels: 64/111] test-sixels: Include stdbool.h to permit using bool in C.

[Christian Persch <chpe src gnome org>]

commit 99a309d8abbcbdc06f3c0b6bcdf116b38d3e6325
Author: Hans Petter Jansson <hpj cl no>
Date:   Sat Aug 8 20:42:49 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 */