Unbreak the build.

Robert Haas <rhaas@postgresql.org>

Commit: 607e75e8f0f84544feb879b747da1d40fed71499
Author: Robert Haas <rhaas@postgresql.org>
Date: 2022-03-23T14:22:54Z
Releases: 15.0
Unbreak the build.

Commit ffd53659c46a54a6978bcb8c4424c1e157a2c0f1 broke the build for
anyone not compiling with LZ4 and ZSTD enabled. Woops.

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