Updating Hamlib to v4+

[vsonnier]

Hamlib 4+ has been relreased : https://github.com/Hamlib/Hamlib/releases/tag/4.1

This is the update of Hamlib to v4+, in particular Windows binaries.

So far I modified CMakeLists.txt to accomodate the lib name change (-4 instead of -2) and added the Windows binaries, and one constant in a Cubic .cpp

So far it compiles (with warnings) both for Win32 and Win64 using VS2019 v16.5

Edit :

• 4.0 : runs without apparent issues, but what should I know ? I don't have Rigs to test with, so I opened this PR :)
• 4.1 : print 2021-03-03:18:22:20.712339: rig_mW2power called then segfault. :(
• 4.2 : same as 4.0 :)

I'm using in both cases the Win Dlls from the Hamlib releases .

Vincent

[vsonnier]

Updated for v4.1, changed title and such.

[vsonnier]

Hamlib v4.2 has just been released: it runs under Win32 / Win64 without crashing this time.