disable string truncation warning

[NathanMOlson]

This "fixes" a compile error experiences on Linux with GCC 11.4.0.

[RobMeades]

Hi, thanks for this: I guess the truncation warning is occurring somewhere other than the ones that we already tried to shut up in 1f93918 and bc8e776?

[NathanMOlson]

Error is at ubxlib/port/platform/linux/src/u_port_uart.c:394:13

[RobMeades]

Interestingly, I changed that very line yesterday, see 208ef1b, so it could be a pointer to a real problem in this case. Don't suppose you'd be willing to pull master from here and see if that happens to have fixed it would you? If it hasn't, I'm also very happy to take your PR as we haven't been able to switch-up to the latest GCC as it messes up something else, and I'm finding this particular GCC warning quite annoying.

[NathanMOlson]

@RobMeades I've pulled your latest changes from master, and it still fails to compile without 06a0869. With that and b08e5ab, I've achieved "hello world" with my M9 receiver.

[RobMeades]

Thanks for checking, and good catch on the b08e5ab, we should add a GNSS device connected via USB in our test system to test that case (only have I2C, SPI and UART today). I will pull your PR locally to run through testing, then merge.