gnu: plasma-framework: Add more optional inputs.

* gnu/packages/kde-frameworks.scm (plasma-frameworks)[native-inputs]: Add
  pkg-config. [inputs]: Add kwayland.

gnu/packages/kde-frameworks.scm

@@ -2916,7 +2916,8 @@ (define-public plasma-framework
      `(("kpackage" ,kpackage)
        ("kservice" ,kservice)))
     (native-inputs
-     `(("extra-cmake-modules" ,extra-cmake-modules)))
+     `(("extra-cmake-modules" ,extra-cmake-modules)
+       ("pkg-config" ,pkg-config)))
     (inputs
      `(("kactivities" ,kactivities)
        ("karchive" ,karchive)
@@ -2938,6 +2939,7 @@ (define-public plasma-framework
        ("ki18n" ,ki18n)
        ("kjobwidgets" ,kjobwidgets)
        ("knotificantions" ,knotifications)
+       ("kwayland" ,kwayland)
        ("kwidgetsaddons" ,kwidgetsaddons)
        ("kwindowsystem" ,kwindowsystem)
        ("kxmlgui" ,kxmlgui)