[PATCH 1/3] kernel32: Support UTF-7 in MultiByteToWideChar. (try 3)

[Henri Verbeet]

The code would probably benefit from a helper function for the base64
decoding, instead of having a nested do-while loop. Also, it's
pointless to have an else-block if you unconditionally break / return
in the preceding if-block. Similarly, if you have an unconditional
break / return in an else-block, it probably should have just been an
if-block instead.