The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2018.03.27.11.59.49 martin src/lib/libm/src/s_scalbn.c,v 1.19 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2018.03.html#2018.03.27.11.59.49