[Users] Unix domain socket directory

[Stainless Steel Rat]

On startup, Claws Mail tries to create a Unix domain socket in $TMPDIR.
The --alternate-config-dir option overrides this directory and causes
Claws Mail to try to create the socket in the specified directory. This
fails if the file system does not support Unix domain sockets. Examples
include the FAT family (such as USB flash drives for portable mail
storage) and EncFS (for encrypted storage).

Is the --alternate-config-dir override of the default socket directory
a bug? Or is this working as intended making an --alternate-socket-dir
option an enhancement?

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