Attempt to fix OS/2 bustage caused by autoconf test that changes the definition of |PRUnichar| from |PRUint16| to |wchar_t| on platforms where |sizeof(wchar_t)| is 2. UniChar was accidentally used in place of PRUnichar. b=54564

widget/src/os2/nsModule.cpp

@@ -269,7 +269,7 @@ PRUnichar *nsWidgetModuleData::ConvertToUcs( const char *szText,
    size_t   ucsLen = ulSize;
    size_t   cSubs = 0;
 
-   UniChar *tmp = pBuffer; // function alters the out pointer
+   PRUnichar *tmp = pBuffer; // function alters the out pointer
 
    int unirc = UniUconvToUcs( converter, (void **)&szText, &szLen,
                               &tmp, &ucsLen, &cSubs);