flatpak: Update Flatpak manifests

Update GitHub Flatpak builds to latest runtime version, add new libs
that we need and remove the ones that are not needed anymore.

pkgs/flatpak/testing/libmicrodns.json

@@ -0,0 +1,21 @@
+{
+    "name": "libmicrodns",
+    "buildsystem": "meson",
+    "config-opts": [
+        "--buildtype=release",
+        "-Dtests=disabled",
+        "-Dexamples=disabled"
+    ],
+    "cleanup": [
+        "/include",
+        "/lib/pkgconfig"
+    ],
+    "sources": [
+        {
+            "type": "git",
+            "url": "https://github.com/videolabs/libmicrodns.git",
+            "tag": "0.2.0",
+            "commit": "deb7ed7bf05dc26802a0ca1987049b31405b8930"
+        }
+    ]
+}