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This commit fixes mingw_lstat by computing the proper size for symlinks according to POSIX. POSIX specifies that upon successful return from lstat: "the value of the st_size member shall be set to the length of the pathname contained in the symbolic link not including any terminating null byte". Prior to this commit the mingw_lstat function returned a fixed size of 4096. This caused problems in git repositories that were accessed by git for Cygwin or git for WSL. For example, doing `git reset --hard` using git for Windows would update the size of symlinks in the index to be 4096; at a later time git for Cygwin or git for WSL would find that symlinks have changed size during `git status`. Vice versa doing `git reset --hard` in git for Cygwin or git for WSL would update the size of symlinks in the index with the correct value, only for git for Windows to find incorrectly at a later time that the size had changed. Signed-off-by: Bill Zissimopoulos <billziss@navimatics.com> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>