lib: disable ASAN redzone around xref_p/xref_array

lib: disable ASAN redzone around xref_p/xref_array

The "xref_p" variables are placed in the "xref_array" section
specifically so they're next to each other and we get an array at the
end.  The ASAN redzone that is inserted around global variables is
breaks that since it'd be inserted before and after each of the array
items.  So disable the ASAN redzone for these variables (and only these
variables, nothing else should be affected.)

Signed-off-by: David Lamparter <equinox@diac24.net>