r315900: /usr/bin/ssh: Undefined symbol "msetlocale"

Having just updated CURRENT to CURRENT 12.0-CURRENT FreeBSD 12.0-CURRENT #1
r315900: Fri Mar 24 14:17:22 CET 2017 amd64, I can not connect to remote
systems via ssh anymore:

/usr/bin/ssh: Undefined symbol "msetlocale"

Google suggests for this kind of error a miscompilation of the binary.

I had a crash, again (SSDs and CURRENT have a serious problem!), had to
improvise with the USB flash ISO image of CURRENT found on FreeBSD.org from
23.03.2017, ~ 18 o'clock, but have rebuilt and installed world and kernel from a
clean /usr/obj two times. Still being bugged by this mysterious error.

Can somebody help, please?

Thanks in advance,
Oliver