Avoid type conversion errors with VLC_TS_*

Without the INT64_C, ES_OUT_SET_PCR was being called with garbage values
(when not on 64-bit systems).
Refs #9828

include/vlc_config.h

@@ -40,8 +40,8 @@
 
 /* All timestamp below or equal to this define are invalid/unset
  * XXX the numerical value is 0 because of historical reason and will change.*/
-#define VLC_TS_INVALID (0)
-#define VLC_TS_0 (1)
+#define VLC_TS_INVALID INT64_C(0)
+#define VLC_TS_0 INT64_C(1)
 
 #define CLOCK_FREQ INT64_C(1000000)