Fix tests that rely on sys.implementation.name to work with circutpython response.

tests/basics/async_await2.py

@@ -1,7 +1,7 @@
 # test await expression
 
 import sys
-if sys.implementation.name == 'micropython':
+if sys.implementation.name in ('micropython', 'circuitpython'):
     # uPy allows normal generators to be awaitables
     coroutine = lambda f: f
 else:

tests/basics/async_for2.py

@@ -1,7 +1,7 @@
 # test waiting within "async for" aiter/anext functions
 
 import sys
-if sys.implementation.name == 'micropython':
+if sys.implementation.name in ('micropython', 'circuitpython'):
     # uPy allows normal generators to be awaitables
     coroutine = lambda f: f
 else:

tests/basics/async_with2.py

@@ -1,7 +1,7 @@
 # test waiting within async with enter/exit functions
 
 import sys
-if sys.implementation.name == 'micropython':
+if sys.implementation.name in ('micropython', 'circuitpython'):
     # uPy allows normal generators to be awaitables
     coroutine = lambda f: f
 else:

tests/basics/sys1.py

@@ -7,7 +7,7 @@ print(type(sys.path))
 print(type(sys.argv))
 print(sys.byteorder in ('little', 'big'))
 print(sys.maxsize > 100)
-print(sys.implementation.name in ('cpython', 'micropython'))
+print(sys.implementation.name in ('cpython', 'micropython', 'circuitpython'))
 
 try:
     sys.exit()