54245985fb Squashed 'src/secp256k1/' changes from 0b70241850..b19c000063 (Pieter Wuille)
Pull request description:
It's been 1.5 years since our secp256k1 subtree was updated, while the upstream project has undergone a number of incremental improvements (performance, tests, build system fixes), plus gained the groundwork for batch verification.
As we're early in the 0.19 window, this seems like a good time to get these merged.
ACKs for commit 99df27:
fanquake:
utACK 99df276 the subtree merge, still need to test the actual changes.
laanwj:
utACK 99df276da
Tree-SHA512: 769a699366321635068ebfbd9d3f30f6e72401c4fcdc1fdc84e5b3fd888c3f01437748f6cd23a507ab47cf04c226cd504fd48aee654457c34bb106c9db7e5c09
1dbbfea9cd