wininet: Deal with bogus accept types array passed into HttpOpenRequestA.

[Hans Leidekker]

The bug reporting agent in Google Sketchup passes an accept types
array that includes a wild pointer and a pointer to an empty string,
both of which are ignored by Windows. Although the wild pointer changed
between a number of tries its high word remained unset, so we may get
away with a check on the high word instead of an exception handler.

Fixes http://bugs.winehq.org/show_bug.cgi?id=11954

 -Hans

Changelog
 Deal with bogus accept types array passed into HttpOpenRequestA.
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