Fixes to get 64 bit stat on NT. Rev: src/backend.cmod:1.39 Rev: src/fdlib.c:1.57 Rev: src/fdlib.h:1.44 Rev: src/modules/HTTPLoop/filesystem.c:1.9 Rev: src/modules/Image/font.c:1.79 Rev: src/modules/files/efuns.c:1.121 Rev: src/modules/files/file.c:1.263 Rev: src/modules/files/file.h:1.25 Rev: src/modules/files/sendfile.c:1.60 Rev: src/modules/files/stat.c:1.26 Rev: src/modules/spider/spider.c:1.122 Rev: src/modules/system/memory.c:1.22 Rev: src/object.c:1.230 Rev: src/post_modules/Shuffler/b_source_normal_file.c:1.9 Rev: src/uncompressor.c:1.7