Preserve list-context MY::test overrides used by Thrift #1658

Summary

Preserve list-context MY::test overrides that call SUPER::test, as used by Thrift 0.22.0, and keep the generated Makefile valid.

Reproduction

Using the unchanged Thrift-0.22.0/Makefile.PL from its CPAN archive with the current PerlOnJava checkout:

package MY;
sub test {
    my @result;
    for (@result = shift->SUPER::test(@_)) {
        s/\$\(TEST_FILES\)/-Igen-perl -Igen-perl2 \$(TEST_FILES)/ig;
    }
    @result;
}

timeout 120 ./jperl Makefile.PL exits successfully, but the generated Makefile has no test target, omits both -Igen-perl and -Igen-perl2, and contains a bare 1 line after config:: pm_to_blib. make rejects that line with missing separator.

The current MakeMaker implementation assigns MY::test(...) in scalar context. Thrift's override returns the list from SUPER::test, so scalar context reduces the result to a count. The current installed SUPER::test stub also needs to provide the default test recipe for this customization to work.

Acceptance criteria

• Invoke MY::test in the context expected by MakeMaker and preserve all returned rule lines.
• A SUPER::test wrapper can modify $(TEST_FILES) and the generated Makefile contains the custom include paths.
• The resulting Makefile parses with make, and its test target uses the generated Thrift modules.
• Keep a regression test based on Thrift's actual override shape, including list return and SUPER::test.