cygwin bootstrap failure IV - undefined reference to `delete_note'

[Billinghurst, David (CRTS)]

A recent check-in has broken bootstrap on cygwin.  The change was after
09-25 12:00 UTC, and probably in the last few hours.  A binary
witch-hunt^H^H^H^H^H^H^H^H search is in progress.

gcc  -DIN_GCC    -g  -W -Wall -Wwrite-strings -Wstrict-prototypes 
-Wmissing-prototypes -Wtraditional -pedantic -Wno-long-long  -DHAVE_CONFIG_H
-o cc1.exe \
        c-parse.o c-lang.o attribs.o c-errors.o c-lex.o c-pragma.o 
c-decl.o c-typeck.o c-convert.o c-aux-info.o c-common.o c-format.o 
c-semantics.o c-dump.o libcpp.a  main.o libbackend.a obstack.o
./intl/libintl.a     ../libiberty/libiberty.a
libbackend.a(final.o): In function `final':
/usr/local/src/gcc/gcc/final.c:1975: undefined reference to `delete_note'
collect2: ld returned 1 exit status
make[2]: *** [cc1.exe] Error 1
make[2]: Leaving directory `/usr/local/obj/gcc/gcc'
make[1]: *** [stage1_build] Error 2
make[1]: Leaving directory `/usr/local/obj/gcc/gcc'
make: *** [bootstrap] Error 2