main: --shot with --headless dumps final LCD on exit

Lets scripted runs feed stdin to the serial console AND capture the
resulting screen, e.g. printf 'ls\nexit\n' | gbc rom.gb --headless --shot 0 out.ppm
Previously --shot ran frames with no stdin, so anything waiting on input
(a shell) only showed its first prompt.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/ppu.c b/src/ppu.c
index 16ecc2e..381c306 100644
--- a/src/ppu.c
+++ b/src/ppu.c
@@ -1,3 +1,4 @@
+#include <stdio.h>
 #include "ppu.h"
 #include <string.h>