fix(build): remove SODIUM_USE_PKG_CONFIG from .cargo/config.toml [env] block
Cargo injects [env] entries directly into build script environments, bypassing shell-level unset and env -u entirely. SODIUM_USE_PKG_CONFIG was set to "0" in [env], which libsodium-sys-stable build.rs treats as "pkg-config enabled" (env::var().is_ok() returns true for any value including "0"). Combined with SODIUM_LIB_DIR set in the workflow, this triggered the incompatibility panic on every build. The original comment claiming this "avoids memset_explicit on Windows" was incorrect — SODIUM_USE_PKG_CONFIG controls detection strategy, not link behaviour. The actual Windows memset_explicit fix is handled via SODIUM_LIB_DIR pointing to pre-built MinGW sodium.
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@ -9,7 +9,4 @@ rustflags = ["-C", "link-arg=-Wl,--exclude-all-symbols"]
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# Use system OpenSSL instead of vendoring from source (which requires Perl modules
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# unavailable on some environments and breaks clippy/check).
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OPENSSL_NO_VENDOR = "1"
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# Force libsodium to use minimal mode which avoids memset_explicit on Windows
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SODIUM_USE_PKG_CONFIG = "0"
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SODIUM_STATIC = "1"
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