leveldb 1.19 is out!

[juliangruber]

https://github.com/google/leveldb/releases/tag/v1.19

A bunch of bug fixes, and in particular those new features:

• Add "approximate-memory-usage" property to leveldb::DB::GetProperty
• Add leveldb::Cache::Prune
• Added leveldb::Status::IsInvalidArgument() method
• Add arm64 support to leveldb
• Now attempts to reuse the preceding MANIFEST and log file when re-opened

The last one should help with start up time a lot if there's a lot of in-flight data on re-open.

The diff can be found here: google/leveldb@v1.18...v1.19

Who wants to take the lead on this? This should be mostly about making sure it still compiles, and exposing the new features if necessary.

[juliangruber]

Actually, I have time right now, I'll get started in a branch and see how far I can get

[juliangruber]

This is my work in progress pull request: #299

[tcr]

This also adds an implementation for MIPS, required for compiling leveldown on the Tessel 2 platform. Excited :) cc tessel/t2-compiler#27