QtGP withExecSuffix is being called multible times

When QtGP is searches the path of ninja from environment PATH it will call withExecsuffic funtion for every folder it goes trough. 

How to fix this:

•  make it so the function is called before going in the for loops and save the output to variable to be used instead calling the function.

See output:

withExecSuffixProblem.txt