timezone changes break windows and cygwin

The latest timezone lib changes seem to have broken Windows and Cygwin
builds comprehensively. I assume that this checkin caused the problem:

http://archives.postgresql.org/pgsql-committers/2005-07/msg00155.php :

Restructure zic #define fprintf checks to use a NO_PGPORT macro instead.

Extracts from buildfarm logs:

Windows:

gcc -O2 -Wall -Wmissing-prototypes -Wpointer-arith -fno-strict-aliasing -g zic.o ialloc.o scheck.o localtime-zic.o -o zic.exe
zic.o(.text+0xe99): In function `dolink':
C:/msys/1.0/home/pgbf/pgbuildfarm/HEAD/pgsql.8032/src/timezone/zic.c:634: undefined reference to `pgsymlink'
zic.o(.text+0xed5):C:/msys/1.0/home/pgbf/pgbuildfarm/HEAD/pgsql.8032/src/timezone/zic.c:613: undefined reference to `pgunlink'
zic.o(.text+0x36ed): In function `writezone':
C:/msys/1.0/home/pgbf/pgbuildfarm/HEAD/pgsql.8032/src/timezone/zic.c:1580: undefined reference to `pgunlink'
localtime-zic.o(.text+0x14c): In function `tzload':
C:/msys/1.0/home/pgbf/pgbuildfarm/HEAD/pgsql.8032/src/timezone/localtime-zic.c:161: undefined reference to `win32_open'

Cygwin:

gcc -O2 -Wall -Wmissing-prototypes -Wpointer-arith -Wendif-labels -fno-strict-aliasing -g zic.o ialloc.o scheck.o localtime-zic.o -o zic.exe
zic.o(.text+0x86c): In function `dolink':
/home/jim/pgbuildfarm/HEAD/pgsql.7860/src/timezone/zic.c:613: undefined reference to `_pgunlink'
zic.o(.text+0x261a): In function `writezone':
/home/jim/pgbuildfarm/HEAD/pgsql.7860/src/timezone/zic.c:1562: undefined reference to `_pgunlink'
collect2: ld returned 1 exit status

cheers

andrew