move qprocess changelog entry to windows section

Change-Id: I0b0475ddd72491cf7b2cef304c434d2311640b84
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
add buildsystem changelog

Change-Id: I84ad3008b7c8431e0874e51b0cdfb677b7ffcb8a
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>