Soname 0 for 1.6 branch

configure.ac

@@ -13,7 +13,7 @@ AC_CONFIG_AUX_DIR(aux_scripts)
 AC_CONFIG_MACRO_DIR([m4])
 
 # Values for SONAME. See -version-info for details.
-AC_SUBST(SONAME_CURRENT, 1)
+AC_SUBST(SONAME_CURRENT, 0)
 AC_SUBST(SONAME_REVISION, 0)
 AC_SUBST(SONAME_AGE, 0)