The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2021.07.10.13.22.01 martin src/tests/lib/libc/stdio/t_fmemopen.c,v 1.6 Logs can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2021.07.html#2021.07.10.13.22.01