Add __errno for newlib targets - #6
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newlib errno is (*__errno()) so rust code can read errno on these targets. std already links it on newlib
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newlib errno is errno() so in rust code ne eds this to read errno on newlib target std already link the symbol
sources
newlib sys/errno.h
https://github.com/eblot/newlib/blob/master/newlib/libc/include/sys/errno.h
Closes rust-lang#1995