Added comio.c (common COM I/O functions) to project.

src/sexpots/sexpots.dsp

@@ -84,6 +84,10 @@ LINK32=link.exe
 # Name "sexpots - Win32 Debug"
 # Begin Source File
 
+SOURCE=..\comio\comio.c
+# End Source File
+# Begin Source File
+
 SOURCE=..\comio\comio_win32.c
 # End Source File
 # Begin Source File