PP: Don't report certain error about '#' when #if'd out #3708
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Don't report the following error when scanning inactive code (e.g. code inside #if 0): "error: '#' : (#) can be preceded in its line only by spaces or horizontal tab" Adds a variable to PpContext to say whether we're currently skipping over an inactive #if/#ifdef/#elif/#else, and don't report the error inside scanToken if true.
fixes 3704