Windows: port dir size computation

src/utils/fstreewalk.cpp

@@ -487,7 +487,11 @@ int64_t fsTreeBytes(const string& topdir)
                                         FsTreeWalker::CbFlag flg) {
             if (flg == FsTreeWalker::FtwDirEnter ||
                 flg == FsTreeWalker::FtwRegular) {
+#ifdef _WIN32
+                totalbytes += st->st_size;
+#else
                 totalbytes += st->st_blocks * 512;
+#endif
             }
             return FsTreeWalker::FtwOk;
         }

src/utils/pathut.cpp

@@ -557,9 +557,9 @@ int path_fileprops(const std::string path, struct stat *stp, bool follow)
     stp->st_ino = mst.st_ino;
     stp->st_dev = mst.st_dev;
     stp->st_ctime = mst.st_ctime;
-#endif
     stp->st_blocks = mst.st_blocks;
     stp->st_blksize = mst.st_blksize;
+#endif
     return 0;
 }