Added a prototype for SHAppBarMessage.

include/shellapi.h

diff --git a/include/shellapi.h b/include/shellapi.h
index 38a05d8..b964fc8 100644
--- a/include/shellapi.h
+++ b/include/shellapi.h
@@ -85,6 +85,7 @@
 	LPARAM	lParam;
 } APPBARDATA, *PAPPBARDATA;
 
+UINT    WINAPI SHAppBarMessage(DWORD,PAPPBARDATA);
 
 /******************************************
  * SHGetFileInfo