Added stub for SetThreadExecutionState (new function in Win98/2000).

diff --git a/include/winbase.h b/include/winbase.h
index 661f86c..9b8ac1c 100644
--- a/include/winbase.h
+++ b/include/winbase.h
@@ -1570,6 +1570,7 @@
 DWORD       WINAPI SetTapePosition(HANDLE,DWORD,DWORD,DWORD,DWORD,BOOL);
 DWORD       WINAPI SetThreadAffinityMask(HANDLE,DWORD);
 BOOL        WINAPI SetThreadContext(HANDLE,const CONTEXT *);
+DWORD       WINAPI SetThreadExecutionState(EXECUTION_STATE);
 BOOL        WINAPI SetThreadLocale(LCID);
 BOOL        WINAPI SetThreadPriority(HANDLE,INT);
 BOOL        WINAPI SetThreadPriorityBoost(HANDLE,BOOL);
diff --git a/include/winnt.h b/include/winnt.h
index a1428ce..fb430e1 100644
--- a/include/winnt.h
+++ b/include/winnt.h
@@ -342,6 +342,7 @@
 typedef LONG            HRESULT;
 typedef DWORD           LCID,       *PLCID;
 typedef WORD            LANGID;
+typedef DWORD		EXECUTION_STATE;
 
 /* Handle type */