Merge pull request #305692 from Naxdy/work/add-python3-to-ecm

kdePackages/ecm: add `python3` to `extraPropagatedBuildInputs`

pkgs/kde/frameworks/extra-cmake-modules/default.nix

···
-{mkKdeDerivation}:
+{ mkKdeDerivation
+, python3
+}:
 mkKdeDerivation {
   pname = "extra-cmake-modules";
 
-  outputs = ["out"];
+  outputs = [ "out" ];
+
+  # Packages that have an Android APK (e.g. KWeather) require Python3 at build time.
+  # See: https://invent.kde.org/frameworks/extra-cmake-modules/-/blob/v6.1.0/modules/ECMAddAndroidApk.cmake?ref_type=tags#L57
+  propagatedNativeBuildInputs = [
+    python3
+  ];
 
   setupHook = ./ecm-hook.sh;
 }