add glibc-stdint.h to vax and lm32 linux target (PR target/105525)

PR target/105525 is a build regression for the vax and lm32 linux
targets present in gcc-12/13/head, where the builds fail due to
unsatisfied references to __INTPTR_TYPE__ and __UINTPTR_TYPE__,
caused by these two targets failing to provide glibc-stdint.h.

Fixed thusly, tested by building crosses, which now succeeds.

Ok for trunk? (Note I don't have commit rights.)

	PR target/105525
gcc/
	* config.gcc (vax-*-linux*): Add glibc-stdint.h.
	(lm32-*-uclinux*): Likewise.