Don't trust isspace() unless isascii() approves

We have seen isspace(0xC3) return true on windows so we need to do
something about this.

As a wise man said:
Using "isspace()" and friends on anything but the 0-127 range is just
fraught with danger, regardless of platform.

We remedy this by checking that isascii() says that its a 7-bit ascii
character, something isspace() knows how to handle

Signed-off-by: Anton Lundin <glance@acc.umu.se>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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