Support symlinks on latest versions of MS-Windows.
src/w32.c: Include winioctl.h and aclapi.h. (is_symlink, chase_symlinks, enable_privilege, restore_privilege) (revert_to_self): Forward declarations of static functions. <static BOOL g_b_init_get_security_info>: <g_b_init_create_symbolic_link>: New static flags. (globals_of_w32): Initialize them to zero. (GetSecurityInfo_Proc, CreateSymbolicLink_Proc): New typedefs. (map_w32_filename): Improve commentary. Simplify switch. (SYMBOLIC_LINK_FLAG_DIRECTORY): Define if not defined in system headers (most versions of MinGW w32api don't). (get_security_info, create_symbolic_link) (get_file_security_desc_by_handle, is_symlink, chase_symlinks): New functions. (sys_access, sys_chmod): Call 'chase_symlinks' to resolve symlinks in the argument file name. (sys_access): Call unc_volume_file_attributes only if GetFileAttributes fails with network-related error codes. (sys_rename): Diagnose renaming of a symlink when the user doesn't have the required privileges. (get_file_security_desc_by_name): Renamed from get_file_security_desc. (stat_worker): New function, with most of the guts of 'stat', and with addition of handling of symlinks and support for 'lstat'. If possible, get file's attributes and security information by handle, not by name. Produce S_IFLNK bit for symlinks, when called from 'lstat'. (stat, lstat): New functions, call 'stat_worker'. (symlink, readlink, careadlinkat): Rewritten to create and resolve symlinks when the underlying filesystem supports them. lib/src/ntlib.c (lstat): New function, calls 'stat'. nt/inc/sys/stat.h (S_IFLNK): Define. (S_ISLNK): A non-trivial definition. (lstat): Prototype instead of a macro that redirects to 'stat'. lisp/files.el (file-truename): Don't skip symlink-chasing part on windows-nt. Incorporate the resolution of 8+3 short aliases on Windows into the loop that recursively chases symlinks. Compare directory and its parent case-insensitively on MS-Windows and MS-DOS. etc/NEWS: Announce the symlink support on MS-Windows.
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