recent changes break gawk compilation

[Arnold Robbins]

Hi.

In trying to keep gawk up to date with gnulib, I find that there are
several recent changes that break compilation. I'm using Ubuntu 22.04.

In the files dfa.h, localeinfo.h, malloc/dynarray.h, and regex_internal.h,
the include of <stdbool.h> was removed. I don't understand why.

In localeinfo.c, a static_assert or two are used instead of the previous
verify() macro.  Gawk sticks to c99 compatibility to support VMS which
only has a C99 front end on the compiler.

Can all of the above be reverted in gnulib please?

Thanks,

Arnold