This was done by introducing another mutex for handling the key_del link
I also renamed all key_del variables to start with key_del prefix


storage/maria/ma_close.c:
  Rename of key_del variables
storage/maria/ma_key_recover.c:
  Changed key_del to be protexted by it's own mutex: key_del_lock
  Rename of key_del variables
  Removed comment for old bug
storage/maria/ma_key_recover.h:
  Rename of key_del variables
storage/maria/ma_open.c:
  Initialization for new key_del_lock mutex
  Renamed intern_cond to key_del_cond as it was only used for protection of key_del
storage/maria/ma_page.c:
  Rename of key_del variables
storage/maria/ma_write.c:
  Rename of key_del variables
storage/maria/maria_def.h:
  Rename of key_del variables
  Added key_del_lock