PlugIn: do not define core Windows types on Windows

Do not attempt to define the core COM types on Windows.  These conflict
with the system provided definitions which are included via
ForSwiftFoundationOnly.h.

Author: compnerd

CoreFoundation/PlugIn.subproj/CFPlugInCOM.h

@@ -20,10 +20,12 @@ CF_EXTERN_C_BEGIN
 /* The _reserved field is part of the Microsoft COM binary standard on Macintosh. */
 /* You can declare new C struct interfaces by defining a new struct that includes "IUNKNOWN_C_GUTS;" before the first field of the struct. */
 
+#if !TARGET_OS_WIN32
 typedef SInt32 HRESULT;
 typedef UInt32 ULONG;
 typedef void *LPVOID;
 typedef CFUUIDBytes REFIID;
+#endif
 
 #define SUCCEEDED(Status) ((HRESULT)(Status) >= 0)
 #define FAILED(Status) ((HRESULT)(Status)<0)