[avr-gcc-list] New GCC warning - how to silence?

[larry barello]

This is a new warning with the latest WinAvr.  What does it mean and how do
I silence it?  It is highly annoying that the buffers are even concerned
whether a byte value is signed or not when dealing with characters.

TetherTask.c:191: warning: pointer targets in passing argument 1 of
'sscanf_P' differ in signedness