add safe wxStrlcpy() function and replaced all wxStrncpy() calls by it

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@57023 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/window.cpp

@@ -3850,8 +3850,7 @@ bool wxWindowMSW::HandleTooltipNotify(WXUINT code,
         // if we got TTN_NEEDTEXTW in Unicode build: in this case we just have
         // to copy the string we have into the buffer
         static wxChar buf[513];
-        wxStrncpy(buf, ttip.c_str(), WXSIZEOF(buf) - 1);
-        buf[WXSIZEOF(buf) - 1] = _T('\0');
+        wxStrlcpy(buf, ttip.c_str(), WXSIZEOF(buf));
         ttText->lpszText = buf;
     }