Update configure.ac to include compiler/cpp directory

Reviewed By: aditya


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@664954 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/configure.ac b/configure.ac
index 8168a12..0d1207d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -8,6 +8,6 @@
 
 AC_CONFIG_FILES([Makefile])
 
-AC_CONFIG_SUBDIRS([lib/cpp lib/php lib/py])
+AC_CONFIG_SUBDIRS([compiler/cpp lib/cpp lib/php lib/py])
 
 AC_OUTPUT