ninja_syntax.py: remove unused has_path argument
ninja_syntax.py: remove unused has_path argument

The usage of the parameter was removed a long time ago and was never cleaned up. The argument is not provided in the test.
mydongistiny/ninja,AoD314/ninja,martine/ninja,ndsol/subninja,sgraham/ninja,iwadon/ninja,Qix-/ninja,bradking/ninja,ninja-build/ninja,ndsol/subninja,sgraham/ninja,nicolasdespres/ninja,martine/ninja,bradking/ninja,AoD314/ninja,sgraham/ninja,nicolasdespres/ninja,nicolasdespres/ninja,maruel/ninja,AoD314/ninja,ninja-build/ninja,mydongistiny/ninja,ninja-build/ninja,bradking/ninja,atetubou/ninja,ndsol/subninja,sgraham/ninja,ndsol/subninja,mydongistiny/ninja,Qix-/ninja,maruel/ninja,iwadon/ninja,martine/ninja,atetubou/ninja,maruel/ninja,AoD314/ninja,ninja-build/ninja,mydongistiny/ninja,atetubou/ninja,bradking/ninja,atetubou/ninja,nicolasdespres/ninja,iwadon/ninja,Qix-/ninja,maruel/ninja,iwadon/ninja,Qix-/ninja,martine/ninja