Don't make it possible to define HAVE_HAL but not enable it in automake
Don't make it possible to define HAVE_HAL but not enable it in automake

* configure.in: With the previous logic, if libhal_get_all_devices
  function was not found, HAVE_HAL would be defined for the preprocessor
  but it wouldn't be enabled in automake conditionals, causing the final
  link to fail with missing references to HAL entries.

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