The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2018.11.15.11.18.33 maxv src/sys/sys/mbuf.h,v 1.215 2018.11.15.11.20.59 kre src/sys/arch/x86/x86/efi.c,v 1.17 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2018.11.html#2018.11.15.11.20.59