Remove another copied source file on "make clean".

(closes issue #11137)
Reported by: IgorG
Patches: 
      addonclean-87971-1.patch uploaded by IgorG (license 20)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@88062 65c4cc65-6c06-0410-ace0-fbb531ad65f3

utils/Makefile

@@ -61,7 +61,7 @@ clean:
 	rm -f *.s *.i
 	rm -f md5.c strcompat.c ast_expr2.c ast_expr2f.c pbx_ael.c pval.c
 	rm -f aelparse.c aelbison.c conf2ael
-	rm -f utils.c sha1.c astobj2.c hashtest2
+	rm -f utils.c threadstorage.c sha1.c astobj2.c hashtest2
 
 md5.c: ../main/md5.c
 	@cp $< $@