Update xz to 5.2.0.

[rpaulo]

Summary

Update xz to 5.2.0.

This brings support for multi-threaded encoding/decoding.

Test Plan

Build and test it.

[rpaulo]

Add lzma.h to ObsoleteFiles.inc.

[rpaulo]

Forgot to link liblzma with pthread.
Add a few more files to the build.

[bapt]

This would need an exp-run because everything statically linking to libarchive will now need to also be linked to pthread (pkg-static in particular will fail I'm almost sure of that)

pthread is not a lightweight change and may break some binaries at runtime as well.

src.libnames.mk should be modified as well

_DP_lzma= pthread

lib/liblzma/Makefile

167 ↗

(On Diff #3671)

This should be updated according to the liblzma.pc.in changes
so that -pthread is specified in Libs.private

[bapt]

if everything goes ok, do not MFC that before pthread support change from @kostikbel have been MFCed if not MFCed already

[rpaulo]

Fix /rescue.

[rpaulo]

Fix the prebuild libs dependency.

[rpaulo]

lib/liblzma/Makefile

167 ↗

(On Diff #3671)

Why wouldn't the library dependency work? liblzma depends on libpthread.

[rpaulo]

Fix src.libnames.mk

[rpaulo]

In D1786#7, @bapt wrote:

This would need an exp-run because everything statically linking to libarchive will now need to also be linked to pthread (pkg-static in particular will fail I'm almost sure of that)

Well, I asked for the exp-run, but pkg-static didn't break. pkg-static links with "-llzma" not with liblzma.a, so the dependency chain works. I just tested this myself.

[bapt]

That is great I have no more problems as long as the exp-run is ok then

[rpaulo]

Closed by commit rS278433 (authored by @rpaulo).