[PATCH v5 0/3] relative path regression fix

Update since v4:

 * Update commit logs with the help from Sebastian Schuberth:

   s/MINGW/MSYS/i
   s/dos-driver-prefix/dos-drive-prefix/

Jiang Xin (3):
  test: use unambigous leading path (/foo) for MSYS
  relative_path should honor dos-drive-prefix
  Use simpler relative_path when set_git_dir

 cache.h               |  1 +
 path.c                | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++
 setup.c               |  5 +---
 t/t0060-path-utils.sh | 60 +++++++++++++++++++++++++----------------------
 4 files changed, 99 insertions(+), 32 deletions(-)