avformat/async: Allow compilation with native threads.

configure

@@ -2693,7 +2693,7 @@ x11grab_indev_deps="x11grab"
 x11grab_xcb_indev_deps="libxcb"
 
 # protocols
-async_protocol_deps="pthreads"
+async_protocol_deps="threads"
 bluray_protocol_deps="libbluray"
 ffrtmpcrypt_protocol_deps="!librtmp_protocol"
 ffrtmpcrypt_protocol_deps_any="gcrypt gmp openssl"

libavformat/async.c

@@ -34,9 +34,9 @@
 #include "libavutil/fifo.h"
 #include "libavutil/log.h"
 #include "libavutil/opt.h"
+#include "libavutil/thread.h"
 #include "url.h"
 #include <stdint.h>
-#include <pthread.h>
 
 #if HAVE_UNISTD_H
 #include <unistd.h>