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If symlinks are enabled, resolve all symlinks when changing directories, as required by POSIX. Note: Git's real_path() function bases its link resolution algorithm on this property of chdir(). Unfortunately, the current directory on Windows is limited to only MAX_PATH (260) characters. Therefore using symlinks and long paths in combination may be problematic. Note: GetFinalPathNameByHandleW() was introduced with symlink support in Windows Vista. Thus, for compatibility with Windows XP, we need to load it dynamically and behave gracefully if it isnt's available. Signed-off-by: Karsten Blees <blees@dcon.de>