Yuqi Gu e171a219d5 Fix db_wal_test::TruncateLastLogAfterRecoverWithoutFlush failure (#6437)
Summary:
`TruncateLastLogAfterRecoverWithoutFlush` case depends on fallocate support
of underlying file system.

On a file system which lacks of this feature, like zfs, it will fail to allocate predefined file size as this test case intends to do;

So a check block is added to detect fallocate support and skip test if not.
The related work is done by JunHe77. Thanks!

Signed-off-by: Yuqi Gu <yuqi.gu@arm.com>
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6437

Differential Revision: D20145032

Pulled By: pdillinger

fbshipit-source-id: c8b691dc508e95acfa2a004ddbc07e2faa76680d
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