Use wxDELETE() and wxDELETEA() when possible.

Use wxDELETE[A]() functions which automatically NULL out their arguments after
deleting them instead of doing it manually.

Closes #9685.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64656 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/intl.cpp

@@ -200,8 +200,7 @@ wxLanguageInfoArray *wxLocale::ms_languagesDB = NULL;
 
 /*static*/ void wxLocale::DestroyLanguagesDB()
 {
-    delete ms_languagesDB;
-    ms_languagesDB = NULL;
+    wxDELETE(ms_languagesDB);
 }