now works better with NT

Rev: NT/tools/lib:1.3
Rev: bin/test_pike.pike:1.5
Rev: lib/modules/Stdio.pmod:1.7
Rev: src/fdlib.c:1.2
Rev: src/fdlib.h:1.2
Rev: src/modules/Image/font.c:1.24
Rev: src/modules/files/efuns.c:1.42
Rev: src/modules/files/file.c:1.64
Rev: src/modules/files/socket.c:1.21
Rev: src/modules/files/testsuite.in:1.7
Rev: src/port.c:1.14
Rev: src/testsuite.in:1.63
Rev: src/threads.c:1.50
Rev: src/threads.h:1.24