This update uses as many system shlibs as possible, including llvm10,
which seems to pass the included test suite more or less as well as
using the in-tree, patched llvm9. If any issues arise, it may be
necessary to drop the llvm10 dependency and set USE_SYSTEM_LLVM=0 for a
rebuild.
The linear algebra libraries are still vendored, because julia likes to
use an ILP64 ABI for BLAS while the Void openblas uses an LP64 ABI.
Closes#24097.
Co-authored-by: Adam Beckmeyer <adam_gpg@thebeckmeyers.xyz>
Co-authored-by: Andrew J. Hesford <ajh@sideband.org>
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