include wx/thread.h in debug build which is needed after last change [backport from HEAD]

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@44693 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/db.cpp

@@ -62,6 +62,8 @@ wxChar const *SQL_LOG_FILENAME         = wxT("sqllog.txt");
 wxChar const *SQL_CATALOG_FILENAME     = wxT("catalog.txt");
 
 #ifdef __WXDEBUG__
+    #include "wx/thread.h"
+
     extern wxList TablesInUse;
     extern wxCriticalSection csTablesInUse;
 #endif

src/common/dbtable.cpp

@@ -59,6 +59,8 @@ ULONG lastTableID = 0;
 
 
 #ifdef __WXDEBUG__
+    #include "wx/thread.h"
+
     wxList TablesInUse;
     wxCriticalSection csTablesInUse;
 #endif