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when using gawk 5.4.1 without gmp and mpfr, some alignment is broken in a NODE struct. this causes build failures in downstream packages such as `libpng` and `gcc16`. a discussion of the latter occurred on bug-gawk (https://lists.gnu.org/archive/html/bug-gawk/2026-07/msg00013.html) where the issue was found and pushed to the relevant branch, but has not been released. accordingly, we fetch (manually, since fetchpatch infrecs) the patch from the savannah gitweb. this fixes `libpng` and `gcc16`.