xorg-libx11 in test for tkinter

Author: xhochy

recipe/meta.yaml

@@ -208,6 +208,8 @@ outputs:
         # Tried to use enable_language(C) to avoid needing this. It does not work.
         - {{ compiler('cxx') }}
         - {{ stdlib('c') }}
+        # For tkinter, but we expect from system
+        - xorg-libx11
       files:
         - tests/cmake/*
         - tests/cython/*