Fix piv-tool on wondows
Fix piv-tool on wondows

fopen needs "rb" for fopen in two places

fixes #2338

 On branch piv-tool-windows
 Changes to be committed:
	modified:   piv-tool.c

mouse07410/OpenSC,OpenSC/OpenSC,mouse07410/OpenSC,LudovicRousseau/OpenSC,LudovicRousseau/OpenSC,fabled/OpenSC,dengert/OpenSC,LudovicRousseau/OpenSC,frankmorgner/OpenSC,dengert/OpenSC,metsma/OpenSC,frankmorgner/OpenSC,frankmorgner/OpenSC,mouse07410/OpenSC,philipWendland/OpenSC,fabled/OpenSC,fabled/OpenSC,philipWendland/OpenSC,dengert/OpenSC,philipWendland/OpenSC,metsma/OpenSC,OpenSC/OpenSC,metsma/OpenSC,fabled/OpenSC,frankmorgner/OpenSC,OpenSC/OpenSC