Delete PERL_USE_UNSAFE_INC from test environment

It intereferes with tests of @INC contents, and all core tests must work
without it.

1 files changed, 1 insertions, 0 deletions

diff --git a/t/TEST b/t/TEST
index fc37118770..6d842d0859 100755
--- a/t/TEST
+++ b/t/TEST
@@ -82,6 +82,7 @@ my %temp_no_core =
 my @bad_env_vars = qw(
     PERL5LIB PERLLIB PERL5OPT
     PERL_YAML_BACKEND PERL_JSON_BACKEND
+    PERL_USE_UNSAFE_INC
 );
 
 for my $envname (@bad_env_vars) {