ecore_audio headers conflict with app have ifdefs

ecore_audio headers conflict with app have ifdefs

Ecore_Audio.h had #ifdef HAVE_PULSE ... and that is just so wrong as
this is something an ap[p may or may not set in its config.h ... but
this certainly hase no place in our public headers. the api's there
should always be there... symbols always... just imtplementation may
be empty ... though ecore_audio doesnt build at all without pulse...
so it's moot.

so fix this build issue i found when fixing e build issues with meson
changes etc.

@fix