Refactor the GetSConscriptFilenames() function into an SConsEnvironment method.
Refactor the GetSConscriptFilenames() function into an SConsEnvironment method.

timj/scons,timj/scons,Distrotech/scons,andrewyoung1991/scons,Distrotech/scons,andrewyoung1991/scons,timj/scons,andrewyoung1991/scons,Distrotech/scons,andrewyoung1991/scons,timj/scons,andrewyoung1991/scons,timj/scons,timj/scons,andrewyoung1991/scons,Distrotech/scons,andrewyoung1991/scons,timj/scons,andrewyoung1991/scons,timj/scons,andrewyoung1991/scons,Distrotech/scons,timj/scons