buildworld: don't know how to make iterator.cc

[Randy Bush]

fresh csup, multiple am64 machines trying to go from 8.2 to 9.0

it is also on an one i386 running 9.0

FreeBSD psg.com 9.0-PRERELEASE FreeBSD 9.0-PRERELEASE #2: Sat Dec 24 13:35:25 GMT 2011     root at psg.com:/usr/obj/usr/src/sys/PSG  i386

sh /usr/src/tools/install.sh -s -o root -g wheel -m 555   clang-tblgen /usr/obj/usr/src/tmp/legacy/usr/bin
===> gnu/usr.bin/gperf (obj,depend,all,install)
/usr/obj/usr/src/tmp/usr/src/gnu/usr.bin/gperf created for /usr/src/gnu/usr.bin/gperf
===> gnu/usr.bin/gperf/doc (obj)
/usr/obj/usr/src/tmp/usr/src/gnu/usr.bin/gperf/doc created for /usr/src/gnu/usr.bin/gperf/doc
make: don't know how to make iterator.cc. Stop

randy