Email::Stuff dependency chain: 5 PerlOnJava bug fixes

[fglock]

Summary

Five real PerlOnJava bugs fixed while running ./jcpan -t Email::Stuff. The
distribution chain (MailTools → Mail::Internet → Email::Send →
Email::Stuff) is full of older Perl idioms; each failure exposed a
distinct bug in the parser, runtime, or build glue.

System-perl baseline: 60/61 tests pass (the 1 failure is an unrelated
upstream Email::MIME header-quoting change).

#	File	Bug
1	ExtUtils/MakeMaker.pm	Missing ppd:: target — MailTools/Makefile.PL's MY::postamble adds all:: ppd, which made make die before anything was built. Added a no-op rule + .PHONY entry.
2	SubroutineParser	my $x = new Foo or print "..." produced syntax error ... near "or print ". Indirect-object branch backtracked past the class on infix-op lookahead. Now parses as Foo->new() and lets the outer parser consume the operator.
3	ParserTables	send was not in OVERRIDABLE_OP, so Email::Send's exported send() was rejected with the socket builtin's prototype *$$;$ (Not enough arguments for send). Added send to the override set.
4	Base.java	use base 'IO::Handle' skipped require IO::Handle because the Java backend pre-registers a few bridge stubs (IO::Handle::_sync etc.), which made isPackageLoaded return true. Realigned with real base.pm: only @ISA or $VERSION counts as loaded; otherwise require. If require fails with Can't locate / not found AND code refs exist, accept the in-memory package (preserves the existing DBIC eval-class fix). Fixes Mail::Mailer's $class->SUPER::new.
5	StringDoubleQuoted	s/\b(\w+)/\L\u$1/g produced lc(ucfirst($1)) (lowercases the freshly-uppercased first char) instead of ucfirst(lc($1)). Real Perl applies modifiers per-character left-to-right — for \L\u the first char gets \u, the rest get \L. Fixed applyCaseModifier to pre-wrap with the outer's case function before the single-char wrap. Fixes 6 subtests in MailTools/t/extract.t (Mail::Address->name uses this idiom for title-casing).

Net effect on ./jcpan -t Email::Stuff

Distribution	Before	After
MailTools	make crashed at ppd target	PASS 109/109
Return::Value	PASS	PASS
Email::Send	most test files crashed	89/90 (1 sub fails — see below)
File::Type	PASS	PASS
prefork	PASS	PASS
Email::Stuff	cascade fail	cascade fail (blocked by 1 below)

Remaining blocker (out of scope, documented)

Email::Send/t/sendmail.t writes a fake sendmail with #!$^X (the path to
the jperl bash wrapper) and execs it. macOS does not support
multi-level shebang — the kernel returns ENOEXEC and the calling shell
falls back to interpreting the temp file as bash, producing
syntax error near unexpected token ;. Linux behaviour is similar.
Fix requires replacing the bash wrapper with a small native binary
launcher (jpackage / C / Rust). Documented as item 6 in
dev/modules/email_stuff.md with future-proofing options.

This single subtest failure cascades — CPAN.pm marks Email::Send as
make_test => NO and does not add its blib/lib to @INC for
Email::Stuff's tests, which then fail with Can't locate Email/Send.pm in @INC.

Test plan

• make (full unit-test suite) passes.
• ./jperl -e 'package Foo; sub new {...}; my $x = new Foo or die' no longer fails to parse.
• ./jperl -e 'BEGIN { *send = sub {...} } send;' calls the override.
• ./jperl -e 'package Foo; ... use base "Foo"' still works for in-memory base classes (DBIC pattern).
• ./jperl -MIO::Handle -e 'use base "IO::Handle"; print Foo->new' works.
• ./jperl -e '$_ = "spickett"; s/(\w+)/\L\u$1/; print' prints Spickett.
• ./jcpan -t Email::Stuff reaches each distribution and the only remaining failure in MailTools / Email::Send test suites is t/sendmail.t (item 6).

Files

• src/main/perl/lib/ExtUtils/MakeMaker.pm — ppd:: target
• src/main/java/org/perlonjava/frontend/parser/SubroutineParser.java — indirect object + infix
• src/main/java/org/perlonjava/frontend/parser/ParserTables.java — send override
• src/main/java/org/perlonjava/runtime/perlmodule/Base.java — use base require semantics
• src/main/java/org/perlonjava/frontend/parser/StringDoubleQuoted.java — nested case modifiers
• dev/modules/email_stuff.md — full plan / progress doc
• src/main/java/org/perlonjava/core/Configuration.java — auto-updated commit info

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