For now, there's no analog/scope support in sigrok yet (will be added
later), so remove any such items from the public API (sigrok.h).
Having '#if defined(HAVE_LA_ALSA)' in sigrok.h is a bug anyway, the API
must not have anything device-dependent in general, and sigrok.h
specifically must not have any #ifdefs for specific hardware.
These version numbers represent the sigrok version (i.e., the version
of the tarball, such as "sigrok-0.2.0.tar.gz"), but _not_ the libsigrok
(libtool) library/API/ABI versions. Thus, they should not be in
libsigrok's include file (sigrok.h).