libao now has a plugin API version and stores plugins in the directory "ao#"

where # is the plugin version number.  Now multiple versions of libao can
coexist safely.


git-svn-id: http://svn.xiph.org/trunk/ao@1893 0101bb08-14d6-0310-b084-bc0e0c8e3800

configure.in

@@ -7,15 +7,18 @@ AM_DISABLE_STATIC
 
 dnl Library versioning
 LIB_CURRENT=2
-LIB_REVISION=1
+LIB_REVISION=2
 LIB_AGE=0
 AC_SUBST(LIB_CURRENT)
 AC_SUBST(LIB_REVISION)
 AC_SUBST(LIB_AGE)
 
+dnl Plugin versioning.  We use an integer version number much like LIB_CURRENT.
+PLUGIN_VERSION=2
+
 AC_CANONICAL_HOST
 
-plugindir=$libdir/ao
+plugindir=$libdir/ao$PLUGIN_VERSION
 AC_SUBST(plugindir)
 
 dnl ====================================