pgsql: Fix walmethods.c build without libz

Fix walmethods.c build without libz

Per numerous buildfarm manuals

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/9ae6713cdf32122fa5a0bf15ddcd85f78f6f4631

Modified Files
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src/bin/pg_basebackup/walmethods.c | 5 +++++
1 file changed, 5 insertions(+)

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