salsa20: revert sse2 (#346)

This reverts #328. The changes introduced here generate failure when used in `scrypt`. The `scrypt_block_mix` would generate a different value. Note that this change was never released, so there is no security impact.
RustCrypto · Mar 5, 2024 · fea3dd0 · fea3dd0
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diff --git a/Cargo.lock b/Cargo.lock
diff --git a/salsa20/Cargo.toml b/salsa20/Cargo.toml
@@ -13,7 +13,6 @@ keywords = ["crypto", "stream-cipher", "trait", "xsalsa20"]
 categories = ["cryptography", "no-std"]
 
 [dependencies]
-cfg-if = "1"
 cipher = "=0.5.0-pre.4"
 
 [dev-dependencies]

diff --git a/salsa20/src/backends.rs b/salsa20/src/backends.rs
diff --git a/salsa20/src/backends/soft.rs b/salsa20/src/backends/soft.rs
diff --git a/salsa20/src/backends/sse2.rs b/salsa20/src/backends/sse2.rs