Enable -Wundef
Enable -Wundef

P-Store does not support MiniLZO anymore.

Signed-off-by: Jussi Virtanen <688853f2098600ecc93a73ab459c4906661052bb@reaktor.fi>
Signed-off-by: Pekka Enberg <add4fcd06328a394f0ad91feda7ee057316dc5ed@kernel.org>

penberg/pstore,penberg/pstore,penberg/pstore,penberg/pstore