Define for missing vsprintf_s

[vuki]

Hello puku0x,

Thanks for your code, this is exactly what I needed!

I compiled your code with MinGW compiler on Windows and everything went fine with one small exception. MinGW does not have vsprintf_s function, as it's Microsoft's extension.

Could you please add these lines to ardrone.h?

#ifdef __GNUC__
#define vsprintf_s vsnprintf
#endif

It won't break anything for VisualStudio users and I won't have to modify the code after each new revision.

[puku0x]

Hi vuki,

Thank you for your contribution ! I just know about VisualStudio, so your opinion is really helpful.

I'm going to add them in the next commit.

Thank you again, puku0x

[puku0x]

Hi vuki,

The problem is solved now.

Thank you ! puku0x