Fix static-only wolfSSL linking, improve FFI import errors, and fix make dist

[cconlon]

This PR fixes issue #40 where USE_LOCAL_WOLFSSL with a static-only wolfSSL build fails to produce a working _ffi module, and users get a NameError instead of a useful error message.

• Pass static .a archives directly via extra_objects instead of -lwolfssl, which the linker can't resolve without a shared library present
• Replace silent except ImportError: pass with _FFIPlaceholder that raises ImportError with instructions
• Fix libwolfssl_path global that was always "", breaking optional function detection
• Add .dylib detection for macOS alongside .so
• Fix make dist target that referenced missing ./make/osx/ and ./make/manylinux1/ scripts
• Fix __del__ methods to avoid triggering the placeholder during garbage collection

[Copilot]

Pull request overview

Fixes local/static wolfSSL builds producing a broken _ffi module, improves the user-facing failure mode when CFFI bindings aren’t available, and repairs the make dist packaging target.

Changes:

• Switch static-only linking to pass libwolfssl.a via extra_objects rather than -lwolfssl
• Replace silent _ffi import failures with a placeholder that raises an actionable error
• Improve lib detection (.dylib support) and simplify make dist to build sdist + wheel

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
wolfssl/utils.py	Introduces an _ffi placeholder object to surface meaningful import-time failures
wolfssl/_methods.py	Uses the placeholder on _ffi import failure and adjusts destructor guard logic
wolfssl/_build_ffi.py	Adds robust lib path discovery, optional function probing changes, and static archive linking support
wolfssl/init.py	Uses the placeholder on _ffi import failure and adjusts destructor guard logic
Makefile	Fixes dist target by building sdist + wheel without missing scripts

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