tests/float/byte*_construct: Skip on missing array module.

tests/float/bytearray_construct.py

 # test construction of bytearray from array with float type
 
-from array import array
+try:
+    from array import array
+except ImportError:
+    import sys
+    print("SKIP")
+    sys.exit()
 
 print(bytearray(array('f', [1, 2.3])))

tests/float/bytes_construct.py

 # test construction of bytearray from array with float type
 
-from array import array
+try:
+    from array import array
+except ImportError:
+    import sys
+    print("SKIP")
+    sys.exit()
 
 print(bytes(array('f', [1, 2.3])))