`dll.version` symbol not accessible starting with libMagPlus 4.7.0

[amotl]

Hi there,

when invoking python -m Magics selfcheck on our recent installation [1] on macOS, it slightly croaks like:

$ python -m Magics selfcheck
Found: Magics 'You are using an old version of magics ( < 4.0.0)'.
Library: /usr/local/opt/magics-4.9.3/lib/libMagPlus.dylib
Magics home: /usr/local/opt/magics-4.9.3
Your system is ready.

Other than this, the library appears to be fully functional, so we just wanted to bring this to your attention. Also, #37 and #38 are two outcomes from us approaching this issue, maybe you like them.

With kind regards, Andreas.

[1] Python 3.9.7, MagPlus 4.9.3, Magics HEAD