Avoid gcc warnings.
Simplify the change to not overwrite &cursor->value in LSM lookups.

refs #966
Merge pull request #966 from wiredtiger/lsm-use-local-value

overwriting/leaking the application's WT_ITEM value
Merge branch 'develop' into lsm-empty-value

Conflicts:
	src/lsm/lsm_cursor.c