Fix cross-version upgrade tests.

TestUpgradeXversion knows how to make the main regression database's
references to pg_regress.so be version-independent.  But it doesn't
do that for plperl's database, so that the C function added by
commit b7e3a52a8 is causing cross-version upgrade test failures.
Path of least resistance is to just drop the function at the end
of the new test.

In <= v14, also take the opportunity to clean up the generated
test files.

Security: CVE-2024-10979

1 files changed, 3 insertions, 0 deletions

diff --git a/src/pl/plperl/sql/plperl_env.sql b/src/pl/plperl/sql/plperl_env.sql
index 4108f392d1d..fa5f04146cc 100644
--- a/src/pl/plperl/sql/plperl_env.sql
+++ b/src/pl/plperl/sql/plperl_env.sql
@@ -56,3 +56,6 @@ $$
    }
 
 $$ LANGUAGE plperl;
+
+-- clean up to simplify cross-version upgrade testing
+DROP FUNCTION get_environ();