* cygpath.cc: Throughout, use cygwin_conv_path WIN_W rather than WIN_A
conversion.
(get_long_path_name_w32impl): Remove.
(get_long_name): Drop pre-Windows 2000 accommodations. Just call
GetLongPathNameW here directly.
(get_special_folder): Convert first parameter to WCHAR buffer pointer.
Drop conversion of result from WCHAR * to char *.
(do_sysfolders): Accommodate change to get_special_folder and only
convert result to char * last. Drop pre-Windows 2000 accommodations
and just call GetProfilesDirectoryW directly. Replace call to
GetWindowsDirectoryW with call to GetSystemWindowsDirectoryW.
Just call GetShortPathNameW directly.
(do_pathconv): Simplify buffer handling.