Is your feature request related to a problem? Please describe.
I have this case that I want to develop an app on AppStore for iOS which uses Amber compiler as a dependency. The problem is that Amber is licensed under GPL that does not permit using this compiler as a dependency without the entire project becoming licensed under GPL. Apps licensed as GPL are rejected by the Apple.

Describe the solution you'd like
I would like to propose switching to LGPL license which enables developers to use Amber as a dependency keeping a license they prefer. This is the only modification that LGPL introduces. Other restrictions of GPL will still apply.

All of current rust dependencies are under either MIT, Apache 2.0, MPL 2.0 which are compatible with LGPL.