Fix more c23 bool fallout

While these haven't shown up in my tester (not configs I test) and I think
we're likely going to be deprecating the nds32 target. we might as well go
ahead and fix them.

I'm going to include this under the pr117628 umbrella.

	PR target/117628

libgcc/
	* config/arm/freebsd-atomic.c (bool): Remove unnecessary typedef.
	* config/arm/linux-atomic-64bit.c: Likewise.
	* config/arm/linux-atomic.c: Likewise.
	* config/nds32/linux-atomic.c: Likewise.
	* config/nios2/linux-atomic.c: Likewise.