(Windows) fix compiler warnings

[giampaolo]

psutil/_psutil_windows.c(1329) : warning C4995: '_stprintf': name was marked as #pragma deprecated
psutil/_psutil_windows.c(1329) : warning C4995: 'sprintf': name was marked as #pragma deprecated
psutil/_psutil_windows.c(2250) : warning C4995: 'sprintf': name was marked as #pragma deprecated
psutil/_psutil_windows.c(2304) : warning C4995: 'sprintf': name was marked as #pragma deprecated
psutil/_psutil_windows.c(2315) : warning C4995: 'sprintf': name was marked as #pragma deprecated
psutil/_psutil_windows.c(2456) : warning C4995: 'strcat': name was marked as #pragma deprecated
psutil/_psutil_windows.c(2461) : warning C4995: 'strcat': name was marked as #pragma deprecated
psutil/_psutil_windows.c(2464) : warning C4995: 'strcat': name was marked as #pragma deprecated
psutil/_psutil_windows.c(2467) : warning C4995: 'strcat': name was marked as #pragma deprecated
psutil/_psutil_windows.c(2472) : warning C4995: 'strcat': name was marked as #pragma deprecated
psutil/_psutil_windows.c(2474) : warning C4995: 'strcat': name was marked as #pragma deprecated
psutil/_psutil_windows.c(2585) : warning C4995: 'sprintf': name was marked as #pragma deprecated
psutil/_psutil_windows.c(2940) : warning C4995: 'sprintf': name was marked as #pragma deprecated
psutil/_psutil_windows.c(2948) : warning C4995: 'sprintf': name was marked as #pragma deprecated
psutil/_psutil_windows.c(2952) : warning C4995: 'sprintf': name was marked as #pragma deprecated
psutil/_psutil_windows.c(3118) : warning C4995: 'sprintf': name was marked as #pragma deprecated
psutil/_psutil_windows.c(3120) : warning C4995: 'sprintf': name was marked as #pragma deprecated

[giampaolo]

@mrjefftang maybe you want to take a look at this?

[mrjefftang]

I'm not sure when I'll get around to working on this but it's just a matter of using sprintf_s, strcat_s and passing in the buffer size.