added udf_example.def for make dist

sql/Makefile.am

@@ -121,7 +121,7 @@ DEFS =			-DMYSQL_SERVER \
 			@DEFS@
 
 BUILT_SOURCES =		sql_yacc.cc sql_yacc.h lex_hash.h
-EXTRA_DIST =		udf_example.c $(BUILT_SOURCES) \
+EXTRA_DIST =		udf_example.c udf_example.def $(BUILT_SOURCES) \
 			nt_servc.cc nt_servc.h message.mc CMakeLists.txt
 CLEANFILES =        	lex_hash.h sql_yacc.cc sql_yacc.h sql_yacc.output
 AM_YFLAGS =		-d --debug --verbose