[lazarus] LCL: create non-win32 directory

[Micha Nelissen]

Hi,

Problem: unit messages is both present in the lcl and in the fpc rtl for 
  the win32 port. So, the messages unit does not exist in the non-win32 
rtl.

Therefore the suggestion is to move all 'emulation units', like the 
messages unit, to a non-win32 directory and compile it only when the 
target is not win32. Then let the win32 lcl use the fpc win32-rtl one 
and other platforms the 'emulated' one from non-win32 directory.

In the future, Com, Ole, ActiveX can be moved into this non-win32 
directory as well, as the rtl doesn't provide emulation for that.

Regards,

Micha.