Licensing - allow static linking exception

[lkraider]

As the code is licensed under LGPL, static linking gets complicated (compared to dynamic linking).

Please consider licensing the library code with the static linking exception. An easy way could be to adopt the Mozilla License, which is compatible with LGPL and is basically the LGPL + static link exception: https://www.mozilla.org/MPL/2.0/FAQ.html.

There are some platforms where static linking is required or easier, example: iOS/Android. Having the library allow static linking could make it the go-to telegram library for those platforms.

[lkraider]

I am starting an Objective-C iOS wrapper for the library here:
https://github.com/nKey/TGKit/tree/develop

That is the reason I am asking for this exception, so that apps could use the wrapper in the AppStore.

[vysheng]

I'll add it.

[lkraider]

Moved this issue to tgl: vysheng/tgl#1