Bzip2-v1.0.6-0

Import `Bzip2` with `@giordano` and `@ianshmean`'s additions

MPFR-v4.0.2-2

Attempt building `GnuTLS` for musl

GR-v0.39.0-0

Fix many bugs!

LibSSH2-v1.8.2-0

Update `LibSSH2` to `v1.8.2`

NNPACK-v2018.06.22-0

Add GCC v5.1.0

METIS-v5.1.0-0

Update `NNPACK` and build for more platforms

OpenBLAS-v0.3.5-1

Patch OpenBLAS a bit more

dSFMT-v2.2.3-0

Add `dSFMT v2.2.3`

Objconv-v2.49.0-0

Expand `Objconv` build targets

PCRE2-v10.31-0: Roll PCRE2 version back to 10.31

This fixes the stack overflows we see on older MacOS machines