On Windows that would fail because stat() doesn't deal well with our
utf8 strings.
Added new subsurface_stat() portability function to replace stat().
Added Windows implementation of subsurface_stat() using wstat(),
with conversion to ut16 of the inputed path.
Other platform implementations (linux, android) make use of the normal stat().
Added non ASCII test case in TestGitStorage::testGitStorageLocal()
Signed-off-by: Jeremie Guichard <djebrest@gmail.com>
5ed93a9d9e