The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2017.04.20.20.34.24 joerg src/external/bsd/libarchive/Makefile.inc,v 1.3 2017.04.20.21.50.50 christos src/bin/ln/ln.1,v 1.27 2017.04.20.21.50.50 christos src/bin/ln/ln.c,v 1.36 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2017.04.html#2017.04.20.21.50.50