meson: Build qt plugin in C++11 mode explicitly
This works implicitly most of the time, but we need to set it explicitly for building with Android.
Same as gst-plugins-bad!301 (merged). Someone is going to report this eventually.
This works implicitly most of the time, but we need to set it explicitly for building with Android.
Same as gst-plugins-bad!301 (merged). Someone is going to report this eventually.