pgsql: Fix vcregress.pl PROVE_FLAGS bug in commit 93b7d9731f

Fix vcregress.pl PROVE_FLAGS bug in commit 93b7d9731f

This change didn't adjust the publicly visible taptest function, causing
buildfarm failures on bowerbird.

Backpatch to 9.4 like previous change.

Branch
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REL9_5_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/7eb4124da5ba5d905d911a8f786f78df7703c089

Modified Files
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src/tools/msvc/vcregress.pl | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)

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