Make "make clean" rules a bit more standard.

Summary:
make-generic is some sort of internal undocumented thing.
make-local is what is supposed to be used for this stuff.
Also use $(RM) instead of "rm -f".

Reviewed By: marc

Test Plan: make clean


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665498 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/test/java/Makefile.am b/test/java/Makefile.am
index 8cb19ae..853207e 100644
--- a/test/java/Makefile.am
+++ b/test/java/Makefile.am
@@ -1,6 +1,6 @@
 check:
 	$(ANT) test
 
-clean-generic:
+clean-local:
 	$(ANT) clean