unix: set errno in uv_fs_copyfile()
unix: set errno in uv_fs_copyfile()

When the specific value of -1 is returned, uv__fs_work() uses
the value of errno. This commit sets errno in uv__fs_copyfile().

Fixes: https://github.com/nodejs/node/issues/21329
PR-URL: https://github.com/libuv/libuv/pull/1881
Reviewed-By: Santiago Gimeno <3f17e29e343c4cf8809fb0970d81d6d8ee88d6b3@gmail.com>
Reviewed-By: Ben Noordhuis <59bd0a3ff43b32849b319e645d4798d8a5d1e889@bnoordhuis.nl>

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