non-functional backout for review

Some people complaints that new check in __isctype() is not human readable 
and requests for backout. Compiler gives almost identical code for old and 
new excepting non-optimized case where non-human readable one wins. I am a 
bit tired to change it forth and back, so ask for final consensus here.

Old one

return (_c < 0 || _c >= 128) ? 0 :

New one (requests for backout)

return (_c & ~0x7F) ? 0 :

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