[issue11016] Add S_ISDOOR to the stat module

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

>> Apparently, contributor have the illusion that the values they put
>> into the file are somehow standardized, when they are actually not.
> 
> Are there actual bugs with that or is it merely a theoretical concern?

Neither, nor (i.e. it's in the middle). I'm not aware of an actual
problem, but I very much doubt that SF_SNAPSHOT really has the same
meaning on all systems (IOW, chances are high that some system has
allocated the same bit to mean something different).

Looking in more detail: for the S_IFMT flags, OSX/Darwin/FreeBSD defines
0xe000 as S_IFWHT (whiteout), but Solaris defines it as
S_IFPORT (event port).

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