Move MulDiv prototype from wingdi.h to winbase.h where it belongs.

include/winbase.h

@@ -1520,6 +1520,7 @@ BOOL        WINAPI MoveFileW(LPCWSTR,LPCWSTR);
 BOOL        WINAPI MoveFileExA(LPCSTR,LPCSTR,DWORD);
 BOOL        WINAPI MoveFileExW(LPCWSTR,LPCWSTR,DWORD);
 #define     MoveFileEx WINELIB_NAME_AW(MoveFileEx)
+INT         WINAPI MulDiv(INT,INT,INT);
 BOOL        WINAPI NotifyChangeEventLog(HANDLE,HANDLE);
 HANDLE      WINAPI OpenBackupEventLogA(LPCSTR,LPCSTR);
 HANDLE      WINAPI OpenBackupEventLogW(LPCWSTR,LPCWSTR);

include/wingdi.h

@@ -3458,8 +3458,6 @@ BOOL        WINAPI LPtoDP(HDC,LPPOINT,INT);
 BOOL        WINAPI MaskBlt(HDC,INT,INT,INT,INT,HDC,INT,INT,HBITMAP,INT,INT,DWORD);
 BOOL        WINAPI ModifyWorldTransform(HDC,const XFORM *, DWORD);
 BOOL        WINAPI MoveToEx(HDC,INT,INT,LPPOINT);
-/* FIXME This is defined in kernel32.spec !?*/
-INT       WINAPI MulDiv(INT,INT,INT);
 INT       WINAPI OffsetClipRgn(HDC,INT,INT);
 INT       WINAPI OffsetRgn(HRGN,INT,INT);
 BOOL      WINAPI OffsetViewportOrgEx(HDC,INT,INT,LPPOINT);