Windows wants UNC names for COM ports >9 (legacy COM ports only work with one digit)

As UNC also works for smaller names, just retarget all requests for
dev=COMx on win32 to \\.\COMx. Tested with large and small COM port
numbers on XP.

Corresponding to flashrom svn r883.

Signed-off-by: Patrick Georgi <patrick.georgi@coresystems.de>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
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