check-exercises: Skip deprecated exercises (#1169)
check-exercises: Skip deprecated exercises (#1169)

* check-exercises: Skip deprecated or foregone exercises

* check-exercises: Remove conditional for "foregone" key

exercism/xpython,exercism/python,behrtam/xpython,N-Parsons/exercism-python,jmluy/xpython,smalley/python,behrtam/xpython,exercism/python,smalley/python,jmluy/xpython,exercism/xpython,N-Parsons/exercism-python