Ccache docs#13681

Merged

juj merged 3 commits intoemscripten-core:mainfrom

juj:ccache_docs

Mar 17, 2021

Commits on Mar 16, 2021

Add ChangeLog entry for ccache, and document EMCC_CCACHE env. var as internal.
juj
committed
Rename EMCC_CCACHE as internal, add ChangeLog and doc.
juj
committed

Commits on Mar 17, 2021

Docs
juj
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