Testing Alien::wxWidgets 0.46_01

[Mattia Barbon]

  Hi,
Alien::wxWidgets 0.46_01 (just uploaded to CPAN) tries to avoid 
reinstalling the same version of wxWidgets again and again when 
installed from CPAN (there should be no change when installed from the 
command line).

  The new version should only reinstall wxWidgets if it can install a 
newer version and if the installed wxWidgets version was installed by 
Alien::wxWidgets itself.

  I think I tested the relevant use cases, but this is the kind of 
change that need some more real world testing; the expected behaviour is:

- installing A::wx on a system with a system-installed wxWidgets should
  work as before
- installing A::wx on a system with A::wx 0.43 or newer should not
  recompile/reinstall wxWidgets (0.43 started to build/install wxWidgets
  2.8.10)
- installing A::wx on a system with A::wx 0.42 or older should default
  to build and install wxWidgets 2.8.10.

Thanks!
Mattia