Possible misprint in fribidi-bidi.h

Hello.

I noticed, that in fribidi-bidi.h lines 46 and 71 are equal (in latest version, 0.19.5). According to surrounding code, line 46 should look like 

#define fribidi_get_par_direction FRIBIDI_NAMESPACE(get_par_direction)

instead of

#define fribidi_get_par_embedding_levels FRIBIDI_NAMESPACE(get_par_embedding_levels)

This misprint doesn't break anything for now, but in future, if FRIBIDI_NAMESPACE is defined to something else, it will break the api.

Andrey.