Update sys/errno.h from FreeBSD
This is SVN revision 229286 from FreeBSD 9.0.0, with the RISC OS-isms left at the top. The numbers for EDOM, ERANGE, and EILSEQ are redefined if already defined, to sidestep clashes with those defined by ISO9899. Version 5.57. Tagged as 'TCPIPLibs-5_57'
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