11-STABLE and 12-STABLE build failures

[Don Lewis]

I'm seeing this failure when building 11-STABLE and 12-STABLE poudriere
jails:

--- localedef.full ---
cc -O2 -pipe -fno-common -I. -I/var/poudriere/jails/12STABLEamd64/usr/src/usr.bin/localedef -I/var/poudriere/jails/12STABLEamd64/usr/src/lib/libc/locale -I/var/poudriere/jails/12STABLEamd64/usr/src/lib/libc/stdtime -g -std=gnu99 -Qunused-arguments -I/usr/obj/var/poudriere/jails/12STABLEamd64/usr/src/amd64.amd64/tmp/legacy/usr/include  -static  -L/usr/obj/var/poudriere/jails/12STABLEamd64/usr/src/amd64.amd64/tmp/legacy/usr/lib -o localedef.full charmap.o collate.o ctype.o localedef.o messages.o monetary.o numeric.o parser.o scanner.o time.o wide.o  -legacy
ld: error: undefined symbol: yydebug
>>> referenced by localedef.c:276 (/var/poudriere/jails/12STABLEamd64/usr/src/usr.bin/localedef/localedef.c:276)
>>>               localedef.o:(main)
cc: error: linker command failed with exit code 1 (use -v to see invocation)
*** [localedef.full] Error code 1

I hadn't done a build in a while, so I don't know how long this has been
broken.  My builds last night failed and things are still broken right
now.