build: Check relro support using cc.has_link_argument

Meson 0.46 added cc.has_link_argument, which allows us to get rid
of the cc.links hack.

meson.build

@@ -128,7 +128,7 @@ if not get_option('buildtype').startswith('debug')
 endif
 
 foreach link_arg: test_link_args
-  if cc.links('int main () { return 0; }', name: link_arg, args: link_arg)
+  if cc.has_link_argument(link_arg)
     global_link_args += link_arg
   endif
 endforeach