We've added new API and updated an enum. A bunch of function parameters
have been marked as const, but this probably shouldn't count as a change
anyway.
# The stable ABI for client applications, for the version info x:y:z
# always will hold y=z
-AC_SUBST(LIBPULSE_VERSION_INFO, [20:3:20])
+AC_SUBST(LIBPULSE_VERSION_INFO, [21:0:21])
# A simplified, synchronous, ABI-stable interface for client
# applications, for the version info x:y:z always will hold y=z