Make LZMA support optional

[heitbaum]

With the malicious actor changes to upstream xz, make the LZMA library optional. .xz support in pvr.iptvsimple is limited to epg files.

• cross-ref: drop xz package entirely LibreELEC/LibreELEC.tv#8775

[AlwinEsch]

NOTE:: There also xz-utils 5.4.3 where use the bad checksum and possible download from dangerous source place! Should changed too.

-- verifying file...
       file='C:/jenkins-workspace/workspace/binary-addons/kodi-windows-i686-Omega/cmake/addons/build/download/xz-5.4.3.tar.xz'
-- SHA256 hash of
    C:/jenkins-workspace/workspace/binary-addons/kodi-windows-i686-Omega/cmake/addons/build/download/xz-5.4.3.tar.xz
  does not match expected value
    expected: '92177bef62c3824b4badc524f8abcce54a20b7dbcfb84cde0a2eb8b49159518c'
      actual: '6732bd6c5e2cc7f520a645bdb006a286c7790f73950213cd59d2a9e4e4fd3d36'

[AlwinEsch]

NOTE:: There also xz-utils 5.4.3 where use the bad checksum and possible download from dangerous source place! Should changed too.
....

@phunkyfish created a request here about #850

[phunkyfish]

NOTE:: There also xz-utils 5.4.3 where use the bad checksum and possible download from dangerous source place! Should changed too.
....

@phunkyfish created a request here about #850

This won’t work unfortunately. 5.4.1 won’t build for win UWP. So we’ll just need to upload 5.4.3 to our kodi mirrors

[phunkyfish]

I think is too much of a change, we don't link xz with sshd so this is a non-issue IMHO. Plus we are using an older version which should be safe anyway.