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configure: Include <stdio.h> in vsnprintf check
Avoid implicit declaration of vsnprintf for improved C99 compatibility. Otherwise the configure script will fail to detect vsnprintf support with future compilers which do not support implicit function declarations.
Related to:
- https://fedoraproject.org/wiki/Changes/PortingToModernC
- https://fedoraproject.org/wiki/Toolchain/PortingToModernC