Add detach support to execute_process()
Hi,
There is potentially cmsysProcess_SetOption(cp, cmsysProcess_Option_Detach, 1) but it is unavailable from CMake script code. The latest changes (3.0.2 -> 3.6.2) broke a hackish use of 'cmd /C "start /B foot"' so that a cmake -P script doesn't exit anymore.
Regards