plugins: Enable linux-pipewire on FreeBSD

plugins/CMakeLists.txt

@@ -64,6 +64,7 @@ elseif(OS_LINUX)
   check_obs_browser()
 elseif(OS_FREEBSD)
   add_subdirectory(linux-capture)
+  add_subdirectory(linux-pipewire)
   add_subdirectory(linux-pulseaudio)
   add_subdirectory(linux-v4l2)
   add_subdirectory(linux-jack)