Run All: Allow script to access terminal directly
Run All: Allow script to access terminal directly

Before this change the output of `ninja run_all` was buffered.
Consequently we could not see which sub-command caused problems if we
terminated the script before it finished. This behaviour was especially
problematic, if Travis killed the script cause it ran for too long.

mpranj/libelektra,BernhardDenner/libelektra,petermax2/libelektra,petermax2/libelektra,mpranj/libelektra,mpranj/libelektra,ElektraInitiative/libelektra,petermax2/libelektra,mpranj/libelektra,BernhardDenner/libelektra,mpranj/libelektra,ElektraInitiative/libelektra,ElektraInitiative/libelektra,ElektraInitiative/libelektra,mpranj/libelektra,petermax2/libelektra,petermax2/libelektra,e1528532/libelektra,petermax2/libelektra,e1528532/libelektra,petermax2/libelektra,BernhardDenner/libelektra,ElektraInitiative/libelektra,ElektraInitiative/libelektra,ElektraInitiative/libelektra,ElektraInitiative/libelektra,mpranj/libelektra,petermax2/libelektra,ElektraInitiative/libelektra,mpranj/libelektra,BernhardDenner/libelektra,mpranj/libelektra,mpranj/libelektra,e1528532/libelektra,BernhardDenner/libelektra,BernhardDenner/libelektra,BernhardDenner/libelektra,BernhardDenner/libelektra,e1528532/libelektra,e1528532/libelektra,e1528532/libelektra,e1528532/libelektra,ElektraInitiative/libelektra,BernhardDenner/libelektra,ElektraInitiative/libelektra,mpranj/libelektra,petermax2/libelektra,e1528532/libelektra