The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2019.01.05.05.40.00 christos src/external/bsd/wpa/bin/hostapd_cli/Makefile,v 1.4 2019.01.05.05.40.00 christos src/external/bsd/wpa/bin/wpa_cli/Makefile,v 1.6 2019.01.05.05.40.00 christos src/external/bsd/wpa/bin/wpa_passphrase/Makefile,v 1.5 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2019.01.html#2019.01.05.05.40.00