-Werror,-Wduplicate-decl-specifier (extern "C" already in STDAPI)

Change-Id: Ibd633b37e134483b778dcf7bdee1a1a3f377b699

shell/source/win32/shlxthandler/shlxthdl.cxx

@@ -302,7 +302,7 @@ namespace /* private */
 // COM exports
 
 
-extern "C" STDAPI DllRegisterServer()
+STDAPI DllRegisterServer()
 {
     TCHAR ModuleFileName[MAX_PATH];
 
@@ -340,7 +340,7 @@ extern "C" STDAPI DllRegisterServer()
     return hr;
 }
 
-extern "C" STDAPI DllUnregisterServer()
+STDAPI DllUnregisterServer()
 {
     HRESULT hr = S_OK;
 
@@ -370,7 +370,7 @@ extern "C" STDAPI DllUnregisterServer()
     return hr;
 }
 
-extern "C" STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, void** ppv)
+STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, void** ppv)
 {
     *ppv = 0;
 
@@ -397,7 +397,7 @@ extern "C" STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, void** ppv)
     return S_OK;
 }
 
-extern "C" STDAPI DllCanUnloadNow()
+STDAPI DllCanUnloadNow()
 {
     if (CClassFactory::IsLocked() || g_DllRefCnt > 0)
         return S_FALSE;