[cmake-developers] configure_file() missing output file regeneration

[Nils Gladitz]

The output file regeneration introduced in ad502502 and refined by 
38571f2c does not seem to work with the visual studio (tested 2010, 
reportedly also 2012) and Ninja generators.

I merged the topic "output-tracking" which extends the 
RunCMake.configure_file test to find out where it actually does/does not 
work.

I have since then found 9465242d which apparently already tried to fix 
this for Ninja.

Nils