fix: unblock jcpan -t CPAN::Faker (Time::Piece %s, IO::Zlib, glob alias)

[fglock]

Summary

Running ./jcpan -t CPAN::Faker failed in three different places in the dependency chain. Each failure traced back to a real PerlOnJava bug, all fixed in this PR:

1. Time::Piece::strptime did not support %s

Java's DateTimeFormatter has no strftime-style %s (epoch seconds) token, so Time::Piece->strptime($epoch, "%s") returned an empty list and _mktime then died with Day '' out of range 1..31. Special-cased %s in TimePiece::_strptime to parse the input as a Long epoch directly.

Fixes Data::Fake t/dates.t.

2. Compress::Zlib::gzopen failed on non-gzip files in 'rb' mode

zlib's gzopen transparently reads plain (uncompressed) files, but Java's GZIPInputStream throws on missing gzip magic, so IO::Zlib->open returned undef and Archive::Tar->read($file, 1) reported Could not create filehandle for .... Peek at the first two bytes and fall back to a plain InputStream when the file isn't actually gzip-compressed.

Fixes Archive::Any::Create t/01_tar.t.

3. Glob aliasing wasn't propagated through scalar-ref assignment

local *SYM = *foo; *SYM = \$val left $foo unchanged because RuntimeGlob.set(REFERENCE) only updated this.globName and ignored the alias group, while the existing ARRAYREFERENCE and HASHREFERENCE cases already iterated getGlobAliasGroup. Mirrored that loop for the SCALAR case.

Fixes Text::Template's _install_hash, and therefore Module::Faker t/makefile-pl.t and t/requires.t.

Test plan

• make (full unit-test build) passes
• ./jcpan -t CPAN::Faker now runs the whole chain (CPAN::Checksums, Archive::Any::Create, Text::Lorem, Data::Fake, Module::Faker, CPAN::Faker) green:

Running test for module 'CPAN::Checksums'             Result: PASS
Running test for module 'Archive::Any::Create'        Result: PASS
Running test for module 'Text::Lorem'                 Result: PASS
Running test for module 'Data::Fake'                  Result: PASS
Running test for module 'Module::Faker::Dist'         Result: PASS
Running test for module 'CPAN::Faker'                 Result: PASS

• Targeted regression checks for each bug fix:
  • Time::Piece->strptime(1234567890, "%s")->strftime("%Y-%m-%dT%H:%M:%SZ") -> 2009-02-13T23:31:30Z
  • IO::Zlib opens a plain tar file and reads it transparently
  • local *SYM = *main::x; *SYM = \$obj updates $main::x

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