jemalloc: Unthin contrib/jemalloc

Add back more of the release for jemalloc for easier imports
that can be audited for stray changes simply.

However, trim out tests and msvc project files since the

jemalloc: Unthin contrib/jemalloc

Add back more of the release for jemalloc for easier imports
that can be audited for stray changes simply.

However, trim out tests and msvc project files since they are
easy and account for over half the size of the distro.

No functional change.

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