Make cam2map4stereo.py compatible with Python2.4
Make cam2map4stereo.py compatible with Python2.4

Python2.4 doesn't have check_call

DougFirErickson/StereoPipeline,NeoGeographyToolkit/StereoPipeline,DougFirErickson/StereoPipeline,ScottMcMichael/StereoPipeline,NeoGeographyToolkit/StereoPipeline,njwilson23/StereoPipeline,njwilson23/StereoPipeline,DougFirErickson/StereoPipeline,ScottMcMichael/StereoPipeline,DougFirErickson/StereoPipeline,aaronknister/StereoPipeline,aaronknister/StereoPipeline,njwilson23/StereoPipeline,oleg-alexandrov/StereoPipeline,oleg-alexandrov/StereoPipeline,NeoGeographyToolkit/StereoPipeline,oleg-alexandrov/StereoPipeline,njwilson23/StereoPipeline,NeoGeographyToolkit/StereoPipeline,aaronknister/StereoPipeline,aaronknister/StereoPipeline,njwilson23/StereoPipeline,aaronknister/StereoPipeline,oleg-alexandrov/StereoPipeline,ScottMcMichael/StereoPipeline,DougFirErickson/StereoPipeline,njwilson23/StereoPipeline,oleg-alexandrov/StereoPipeline,ScottMcMichael/StereoPipeline,ScottMcMichael/StereoPipeline,ScottMcMichael/StereoPipeline,oleg-alexandrov/StereoPipeline,NeoGeographyToolkit/StereoPipeline,DougFirErickson/StereoPipeline,NeoGeographyToolkit/StereoPipeline