Merge pull request #3383 from BlueMax/musl_build_fix

fix posix/musl build

src/zm_stream.cpp

@@ -26,6 +26,7 @@
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <unistd.h>
+#include <fcntl.h>
 
 StreamBase::~StreamBase() {
 #if HAVE_LIBAVCODEC