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/msdos/utilsdos.cpp

@@ -233,7 +233,7 @@ bool wxGetUserId(wxChar *buf, int n)
     if (!user)
         user = _T("user");
 
-    wxStrncpy(buf, user, n);
+    wxStrlcpy(buf, user, n);
     return true;
 }
 
@@ -254,7 +254,7 @@ bool wxGetHostName(wxChar *buf, int n)
     if (!host)
         host = _T("host");
 
-    wxStrncpy(buf, host, n);
+    wxStrlcpy(buf, host, n);
     return true;
 }