[CMake] looking for Visual Studio installation

[Piotr Dobrogost]

Hi

Recent thread titled "CMAKE_MAKE_PROGRAM is not set." shows cmake needs
some environment variables to find VS command line tools.
Setting of these variables is done by running a bat file that comes with
VS. This seems a little fragile.

Would it be a good idea to make cmake be able to find VS even if these
environment variables weren't set? Maybe using registry or just looking
at default installation folder?

-- 
Piotr Dobrogost
*** curlpp.org - c++ wrapper for libcurl ***