Revert "aix: replace ECONNRESET with EOF if already closed"
Revert "aix: replace ECONNRESET with EOF if already closed"

This reverts commit ca08b48252230db27592248aef10c2d1779bccce, for the
same reasons that it was reverted the last time it was merged.

Refs: https://github.com/libuv/libuv/pull/475
Refs: https://github.com/libuv/libuv/pull/2447
PR-URL: https://github.com/libuv/libuv/pull/2602
Reviewed-By: Ben Noordhuis <59bd0a3ff43b32849b319e645d4798d8a5d1e889@bnoordhuis.nl>
Reviewed-By: Michael Dawson <241bf52ebd97cc4ec83d57b04d1f9e9053df032e@ca.ibm.com>

unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso