Fix a race with verify-visited-file-modtime.
Since at least 1991 Emacs has ignored an mtime difference of no more than one second, but my guess is that this was to work around file system bugs that were fixed long ago. Since the race is causing problems now, let's remove that code. * fileio.c (Fverify_visited_file_modtime): Do not accept a file whose time stamp is off by no more than a second. Insist that the file time stamps match exactly. Fixes: debbugs:12863
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