Bug 8383

The accompanying patch fixes the following three bugs in msdosfs:

1. When msdosfs updates an NT VFAT DOS (short name) directory entry
   it unconditionally clears the lower case flags (in the byte
   immediately following the file attributes).  Thus all NT VFAT
   files with short names when accessed by msdosfs have their NT
   names converted to upper case.

2. msdosfs does not use the NT VFAT lower case flags when converting
   a short name from DOS to UNIX (with -l in effect).  Thus files
   that have short lower case names on NT get upper case names on UNIX.

3. msdosfs updates access times even if the filesystem is mounted
   with "noatime".

Problems #1 and #2 occur because msdosfs is unaware of the
presence of the NT VFAT lower case flags in the directory entry.

NOTE: The Windows 9x VFAT implementation does not use or recognize
      the NT VFAT lower case flags.  Thus it would not be a good
      idea to modify msdosfs to use these flags when creating a
      short lower case filename.

Fix: Apply this patch.

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How-To-Repeat: 
Mount an NT VFAT filesystem with -l.
Copy a file with a short lower case (on NT) name.