event.c: include stdint header

Signed-off-by: aeiouaeiouaeiouaeiouaeiouaeiou <aeioudev@outlook.com>

src/event.c

@@ -21,6 +21,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <errno.h>
+#include <stdint.h>
 
 #include <pthread.h>
 #include <unistd.h>