1.7.0: LT_RELEASE substituted by undefined variables

[dvzrv]

When building 1.7.0 for Arch Linux, I ran into the problem, that in configure.ac the LT_RELEASE variable is substituted by gtkiostream_major_version.gtkiostream_minor_version.gtkiostream_micro_version.
However, none of those variables are set anywhere, which leads to very weird shared object names.

Meanwhile LT_CURRENT is substituted by gtkiostream_current_version:gtkiostream_revision_version:gtkiostream_age_version. Those variables are set. Should they also be used to substitute LT_RELEASE (e.g. gtkiostream_current_version.gtkiostream_revision_version.gtkiostream_age_version)?

Or should LT_RELEASE somehow be dropped entirely? This is quite confusing :)