Deallocate wxThreadSpecificInfo when wxThread ends.

Cleanup wxThreadSpecificInfo after wxThread::Entry returns to be more
memory efficient.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74834 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/private/threadinfo.h

@@ -52,6 +52,13 @@ public:
     wxLocaleUntranslatedStrings untranslatedStrings;
 #endif
 
+#if wxUSE_THREADS
+    // Cleans up storage for the current thread. Should be called when a thread
+    // is being destroyed. If it's not called, the only bad thing that happens
+    // is that the memory is deallocated later, on process termination.
+    static void ThreadCleanUp();
+#endif
+
 private:
     wxThreadSpecificInfo() : logger(NULL), loggingDisabled(false) {}
 };