Help neede with IUP in Nim

[jlp765]

Not able to load a DLL is often because:

  * the DLL is located in a directory that is not in the PATH setting 
(prove/disprove by copying the iup DLL to the same location of your exe file)
  * the DLL name is wrong, (like `iup24d.dll` rather than `iup24.dll`, so 
rename your DLL file)
  * it is a 32 bit DLL on a 64-bit system (or vice versa, so download or build 
the correct DLL for your architecture)