CMake corrections for building on Windows

[bjosv]

• Only use the /Z7 flag on a Visual Studio compilator.
  This flag is not available on a GNU compilator running on windows, like in a mingw64 setup (example).

• Replace newer CMake builtins that does not exists in the minimum required version v3.0.0.
  ADD_COMPILE_DEFINITIONS is replaced with ADD_DEFINITIONS to set defines.
  CMake's Visual Studio generator will replace -D with /D (but all other generators seems not doing the opposite..)

  Fixes The features used are not compatible with the specified minimum version of cmake 3.0 for WIN32. #1105

[bjosv]

@SRyabinin @kristjanvalur My testing seems fine, but please check if reasonable.

[kristjanvalur]

Looks reasonable. Btw, I'm not in any way a CMake expert, I have just sort of tried to do my best to make things work :)

[bjosv]

CMake covers so many targets and options, so in parts we have to go with trial and error I guess..and a lot of googling :)

[michael-grunder]

Merged, thanks!

Also from where I'm sitting you are both CMake gurus 😄