lzma respository of telegramdesktop upgraded to v142 toolset

[truthatt11]

Steps to reproduce

1. Follow the setup step should happen

Expected behaviour

lzma should pass without warning not found v142 toolset
I think adding a git checkout in build_bettergram script would help

Actual behaviour

the lzma lib is not compiled

Configuration

Operating system:
Windows 10

Version of Telegram Desktop:
bettergram git commit c64d74b

Used theme:

Logs:

Insert log.txt here (if necessary)

[ildar-gilmanov]

Please note that the development is stopped. Do not create new Issues.