hardening: enable RELRO by default

Signed-off-by: Steven Barth <steven@midlink.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46004 3c298f89-4303-0410-b956-a3cf2f4a3e73

config/Config-build.in

@@ -270,6 +270,7 @@ menu "Global build settings"
 
 	choice
 		prompt "Enable RELRO protection"
+		default PKG_RELRO_FULL
 		help
 		  Enable a link-time protection known as RELRO (Relocation Read Only)
 		  which helps to protect from certain type of exploitation techniques