RFR: 2628: jdk mailinglist configuration is missing some hotspot directories

[Zhao Song]

Suggestions from Kim Barrett

precompiled - add to hotspot component
sanitizers - add to runtime component
cppstdlib - add to hotspot component
metaprogramming - add to hotspot component

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Commit messages:
 - SKARA-2628

Changes: https://git.openjdk.org/skara/pull/1744/files
  Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1744&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-2628
  Stats: 4 lines in 1 file changed: 4 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/skara/pull/1744.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1744/head:pull/1744

PR: https://git.openjdk.org/skara/pull/1744