src: remove TODO about uv errno removal
This commit removes a TODO regarding the removal of uv errno. errno is currently used and cannot be removed so removing the comment to avoid any confusion.
Refs: https://github.com/nodejs/node/issues/4641
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
src