obs-ffmpeg: Do not include sys/timeb.h on non-Windows system

The struct timeb is used on Windows only.

plugins/obs-ffmpeg/obs-ffmpeg-srt.h

@@ -20,6 +20,9 @@
 #include "obs-ffmpeg-url.h"
 #include <srt/srt.h>
 #include <libavformat/avformat.h>
+#ifdef _WIN32
+#include <sys/timeb.h>
+#endif
 
 #define POLLING_TIME 100 /// Time in milliseconds between interrupt check
 

plugins/obs-ffmpeg/obs-ffmpeg-url.h

@@ -6,7 +6,6 @@
 #include <libavutil/time.h>
 #include <libavutil/error.h>
 #include <stdio.h>
-#include <sys/timeb.h>
 #include <time.h>
 
 #define HTTP_PROTO "http"