The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2023.02.08.12.26.32 christos src/crypto/external/bsd/openssl/lib/libcrypto/bn.inc,v 1.7 Logs can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2023.02.html#2023.02.08.12.26.32