[MSVCRT] xxopen() accepts speces in the mode string

[Uwe Bonnes]

This silences 

fixme:msvcrt:msvcrt_get_flags :unknown flag   not supported

when running msvcrt/tests/file.c while native msvcrt doesn't warn or tell
anything. 
 
-- 
Uwe Bonnes                bon at elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
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