pgsql: Avoid unportable shell syntax in pg_upgrade's test script.

Avoid unportable shell syntax in pg_upgrade's test script.

Most of test.sh uses traditional backtick syntax for command substitution,
but commit da9b580d8 introduced two uses of $(...) syntax, which is not
recognized by very old shells. Bring those into line with the rest.

Victor Wagner

Discussion: /messages/by-id/20180720153820.69e9ae6c@fafnir.local.vm

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/986127e3db6858c461dae00f23c1fbaf9302d8cb

Modified Files
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src/bin/pg_upgrade/test.sh | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)