feat: add openssl as dependency for gstreamer bad plugins to includ…

…e dtls

As per https://gitlab.freedesktop.org/Ben-xD/gstreamer/blob/2e198d4e59e107126baafa1b863f75bbdef19c17/subprojects/gst-plugins-bad/ext/dtls/meson.build#L24, dtls is part of gst-plugins-bad, and relies on gstreamer, libcrypto, openssl and winsock2.

I haven't confirmed that this works because my build fails when I add `openssl` as a dependency: `gvsbuild build gtk4 pygobject pycairo gstreamer gst-plugins-base gst-plugins-good gst-plugins-bad gst-plugins-ugly gst-python webrtc-audio-processing --enable-gi --py-wheel --clean`

Just building openssl takes a very long time: `gvsbuild build openssl` (currently building)

gvsbuild/projects/gstreamer.py

@@ -160,6 +160,7 @@ def __init__(self):
                 "ninja",
                 "gst-plugins-base",
                 "webrtc-audio-processing",
+                "openssl"
             ],
             patches=[
                 "wasapisink-reduce-buffer-latency.patch",