wxdragon-sys: switch reqwest TLS from rustls to native-tls

[LeonarddeR]

Summary

Fixes #153.

wxdragon-sys uses reqwest as a build dependency to download the wxWidgets zip archive during the initial build. The previous configuration used rustls, which pulls in aws-lc-sys and ring — both require CMake and C compilation, adding significant overhead to every fresh build.

This PR switches to native-tls, delegating TLS to the OS TLS stack on each platform:

• Windows: SChannel (built-in, no extra deps)
• macOS: Secure Transport (built-in, no extra deps)
• Linux: OpenSSL — already required via libssl-dev since 74eb0d7 (WebKitGTK)

The socks feature is also dropped — proxy support for a fixed-URL download is unnecessary (HTTP proxy via git config http.proxy continues to work as before).

Impact

• Removes ~42 transitive crates from the build graph, including aws-lc-sys, ring, quinn, rustls, and the full JNI/Android stack pulled in by rustls-platform-verifier
• Eliminates two CMake-based C compilation steps on every fresh build
• No behaviour change at runtime — the download is a one-time bootstrap operation
• No regression in toolchain requirements on any platform

Change

# Before
reqwest = { version = "0.13.4", default-features = false, features = ["blocking", "rustls", "socks"] }

# After
reqwest = { version = "0.13.4", default-features = false, features = ["blocking", "native-tls"] }

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