Rename "alterl" to "erl".


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@666481 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/lib/Makefile.am b/lib/Makefile.am
index 8cbb80f..58ef555 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -11,7 +11,7 @@
 endif
 
 if ENABLE_ERLANG
-SUBDIRS += alterl
+SUBDIRS += erl
 endif
 
 EXTRA_DIST = \