Making maria-recover.test work the same with debug and non-debug builds: one error message was specific of
debug builds and is now removed, left only in non-ha-maria programs.

mysql-test/r/maria-recover.result:
  This warning is not thrown anymore when used in ha_maria
mysql-test/t/maria-recover.test:
  In this patch, corruption warnings are unified between debug and non-debug builds, so test can run on both
storage/maria/ha_maria.cc:
  declare that Maria is used from ha_maria
storage/maria/ma_static.c:
  new variable to tell if Maria is used from ha_maria
storage/maria/maria_def.h:
  Comment describing what maria_print_error() does. And change of this macro: it now does nothing when Maria
  is used from ha_maria.