tools: add new headers to tarball
Missed in https://github.com/nodejs/node/pull/20789 (I had mistakenly assumed the headers were picked up from the listing in node.gyp... and regular CI doesn't cover this).
Fixes: https://github.com/nodejs/node/issues/20921
This needs to be fast tracked and a new 10.2.1 release spun up as soon as it lands.
/cc @richardlau @MylesBorins
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines