Support iOS dylib/executables

[mmastrac]

This should be a simple cfg line but will need testing.

[sagebind]

Seemingly constructors are defined in the same way as macOS: https://stackoverflow.com/questions/59271654/what-does-attribute-constructor-compile-to-for-ios-how-to-do-it-in-hand. Testing remains though.

[Absolucy]

Should be closed by #69 (nice)

[mmastrac]

Fixed by @Luxxxxy, thanks!

[mmastrac]

Published as 0.1.15