Changes for Windows NT

Rev: src/acconfig.h:1.12
Rev: src/backend.c:1.19
Rev: src/configure.in:1.143
Rev: src/fd_control.c:1.9
Rev: src/lex.c:1.35
Rev: src/modules/files/acconfig.h:1.5
Rev: src/modules/files/configure.in:1.35
Rev: src/modules/files/efuns.c:1.40
Rev: src/modules/files/file.c:1.62
Rev: src/modules/files/socket.c:1.19
Rev: src/modules/spider/accesseddb.c:1.12
Rev: src/modules/spider/configure.in:1.20
Rev: src/modules/spider/dumudp.c:1.29
Rev: src/modules/system/configure.in:1.13
Rev: src/modules/system/system.c:1.32
Rev: src/pike_macros.h:1.5
Rev: src/signal_handler.c:1.15
Rev: src/time_stuff.h:1.4
Rev: src/version.c:1.25