Fixes for Windows:

* Augment the stock FindJPEG cmake module to also find the newest
  versions for each library.

* FindOpenEXR.cmake and FindIlmBase.cmake modules now also find OpenEXR
  2.1 libs build cmake. On Windows these libraries have an _2_1.lib
  version suffix by default.

* Remove the add_dll_files step for windows installation. The dlls
  listed in the macro are all hardcoded and outdated paths depending on
  certain library versions used and break the make install command.