[fpc-devel] Serial unit for windows

[Stephano]

I have made some modifications to the windows unit of Luis R. Hilario B. 
in order to pave the way for cross-platform usage.

I would like to have feedback before touching the Unix serial unit.

Any testing and/or input is appreciated.

======================================================================
TSerialFlag has been introduced because the flags should not normally be 
mixed.

The following flow control options are available:
   None
   Xon/Xoff
   RTS/CTS
   DTR/DSR

TSerialFlags was left for compatibility reasons. It could be abolished 
in the future.

Procedure SerSet was overloaded to use both TSerialFlag and SerialFlags.

If a port fails to open, SerOpen will return UnusedHandle to have 
multiplatform compatibility.

There are 2 constants in unit rtl\win\wininc\struct.inc that seem to be 
wrongly declared:
   bm_DCB_fRtsControl = $3000. It should be $2000.
   bm_DCB_fDtrControl = $30. It should be $20.

When these are corrected, the -$1000 and -$10 in the code below should 
be removed accordingly.
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