sys/newlib: Fix function definitions to match newlib prototypes #5214
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Last-minute bugfix
https://cygwin.com/git/gitweb.cgi?p=newlib-cygwin.git;a=blob;f=newlib/libc/include/reent.h;h=861be71d35326ba329ec479587b6df26a68e62b2;hb=HEAD#l151
http://linux.die.net/man/3/open