The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2017.01.12.18.16.52 christos src/lib/libc/gen/syslog.c,v 1.58 2017.01.12.18.16.52 christos src/lib/libc/include/namespace.h,v 1.184 2017.01.12.18.16.52 christos src/lib/libc/stdio/vsnprintf.c,v 1.29 2017.01.12.18.19.31 abhinav src/share/man/man7/sysctl.7,v 1.110 2017.01.12.18.23.04 christos src/lib/librumpuser/rumpuser_port.h,v 1.48 2017.01.12.18.26.08 maya src/sys/dev/usb/if_aue.c,v 1.141 2017.01.12.18.26.08 maya src/sys/dev/usb/if_axe.c,v 1.80 2017.01.12.18.26.08 maya src/sys/dev/usb/if_cdce.c,v 1.44 2017.01.12.18.26.08 maya src/sys/dev/usb/if_cue.c,v 1.76 2017.01.12.18.26.08 maya src/sys/dev/usb/if_kue.c,v 1.89 2017.01.12.18.26.08 maya src/sys/dev/usb/if_udav.c,v 1.51 2017.01.12.18.26.08 maya src/sys/dev/usb/if_upl.c,v 1.59 2017.01.12.18.26.08 maya src/sys/dev/usb/if_url.c,v 1.56 2017.01.12.18.29.14 christos src/sys/sys/sigtypes.h,v 1.11 2017.01.12.18.37.09 abhinav src/external/bsd/top/dist/top.1.in,v 1.10 2017.01.12.18.40.02 christos src/sys/ufs/lfs/lfs_accessors.h,v 1.47 2017.01.12.18.42.53 christos src/include/arpa/ftp.h,v 1.7 2017.01.12.18.42.53 christos src/include/arpa/telnet.h,v 1.13 2017.01.12.18.50.17 christos src/sys/sys/file.h,v 1.80 2017.01.12.18.52.15 christos src/usr.bin/sockstat/sockstat.c,v 1.18 2017.01.12.19.02.22 maya src/lib/libarch/x86_64/x86_64_iopl.c,v 1.3 2017.01.12.19.03.09 christos src/sys/sys/bitops.h,v 1.12 2017.01.12.19.07.14 christos src/external/bsd/libarchive/include/config_netbsd.h,v 1.6 2017.01.12.19.10.00 christos src/external/gpl3/gcc/dist/gcc/diagnostic.c,v 1.3 2017.01.12.19.10.34 christos src/share/mk/bsd.sys.mk,v 1.266 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2017.01.html#2017.01.12.19.10.34