Add files to CLEANFILES for robust make clean.

At the least, $(BUILT_SOURCES) should be added to CLEANFILES. Also
beneficial is $(api_DATA), and in the case of Java, *.files and *.h.
Also there is a vpp/app/version.h, and some grammar and lex files in
vppapigen.

Change-Id: Ic6d3f2d40ce65e1d9a8b88217fa1f36de393ebb4
Signed-off-by: Burt Silverman <burtms@gmail.com>
diff --git a/src/vpp-api/java/Makefile.am b/src/vpp-api/java/Makefile.am
index 3696e5b..6eb5008 100644
--- a/src/vpp-api/java/Makefile.am
+++ b/src/vpp-api/java/Makefile.am
@@ -218,7 +218,7 @@
 #
 # Cleanup
 #
-CLEANFILES = jvpp-registry.ok $(JAR_FILES) $(BUILT_SOURCES)
+CLEANFILES = jvpp-registry.ok $(JAR_FILES) $(BUILT_SOURCES) *.files */*.h
 
 clean-local:
 	rm -rf $(CLEANDIRS)