added -Werror

git-svn-id: svn://bind10.isc.org/svn/bind10/trunk@1294 e5f2f494-b856-4b98-b285-d166d9295462

src/lib/dns/Makefile.am

@@ -1,6 +1,6 @@
 SUBDIRS = . tests
 
-AM_CPPFLAGS = -I$(top_builddir)/src/lib -I$(top_srcdir)/ext
+AM_CPPFLAGS = -I$(top_builddir)/src/lib -I$(top_srcdir)/ext -Wall -Werror
 
 CLEANFILES = *.gcno *.gcda
 CLEANFILES += rrclass.h rrtype.h rrparamregistry.cc rdataclass.h rdataclass.cc