Speed up most calls to 'stat' and 'lstat' on MS-Windows.
src/w32.c (stat_worker): If w32_stat_get_owner_group is zero, do not try to get accurate owner and group information from NT file security APIs. This is to make most callers of 'stat' and 'lstat', which don't need that information, much faster. src/dired.c (Ffile_attributes) [WINDOWSNT]: Set w32_stat_get_owner_group to a non-zero value, to request accurate owner and group information from 'lstat'. nt/inc/sys/stat.h: Declare w32_stat_get_owner_group.
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