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Partial, Meson-only implementation of #2976 for non-MSVC builds. Due to the prevalence of private symbol reuse, linking to a shared library is simply utterly unreliable, but we still want to defer to the shared library for installable applications. By linking to both, we can share symbols where possible, and statically link where needed. This means we no longer need to manually track every file that needs to be extracted and reused. The flip side is that MSVC completely does not support this, so for MSVC builds we just link to a full static copy even where -Ddefault_library=shared. As a side benefit, by using library inclusion rather than including extra explicit object files, the zstd program shrinks in size slightly (~4kb).