Without this change, the target of a symbolic link that points to a UNC
share would include UNC in the target path, and not be correctly made
absolute.
Add a relevant test case, and use the opportunity to factor out the
helper code that creates NTFS symlinks into a function that takes
care of error handling.
The file created with the new test case only gets cleaned up correctly
when passing the file path into QDir::rmdir, which is either way the
right thing to do.
[ChangeLog][QtCore][QFileInfo] Fixed resolving of symbolic links to UNC
shares on NTFS file systems.
Change-Id: I9ba75d627aedf7c4cc289f0cb71088d795d30d8a
Fixes: QTBUG-73688
Task-number: QTBUG-63970
Task-number: QTBUG-30401
Task-number: QTBUG-20791
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>