Add prototypes for some Gdi* functions.

include/wingdi.h

@@ -3335,9 +3335,14 @@ BOOL      WINAPI FixBrushOrgEx(HDC,INT,INT,LPPOINT);
 BOOL      WINAPI FlattenPath(HDC);
 BOOL      WINAPI FloodFill(HDC,INT,INT,COLORREF);
 BOOL      WINAPI FrameRgn(HDC,HRGN,HBRUSH,INT,INT);
+BOOL      WINAPI GdiAlphaBlend(HDC,int,int,int,int,HDC,int,int,int,int,BLENDFUNCTION);
 BOOL      WINAPI GdiComment(HDC,UINT,const BYTE *);
 DEVMODEW * WINAPI GdiConvertToDevmodeW(const DEVMODEA *);
 BOOL      WINAPI GdiFlush(void);
+BOOL      WINAPI GdiIsMetaFileDC(HDC);
+BOOL      WINAPI GdiIsMetaPrintDC(HDC);
+BOOL      WINAPI GdiIsMetaPlayMetafileDC(HDC);
+BOOL      WINAPI GdiTransparentBlt(HDC,int,int,int,int,HDC,int,int,int,int,UINT);
 INT       WINAPI GetArcDirection(HDC);
 BOOL      WINAPI GetAspectRatioFilterEx(HDC,LPSIZE);
 LONG      WINAPI GetBitmapBits(HBITMAP,LONG,LPVOID);