Another attempt to make it possible to build without openssl.

You'll need to cd into crates/rqbit to build with selective features.

crates/bencode/Cargo.toml

@@ -5,9 +5,15 @@ edition = "2018"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[features]
+default = ["sha1-openssl"]
+sha1-system = ["sha1w/sha1-system"]
+sha1-openssl = ["sha1w/sha1-openssl"]
+sha1-rust = ["sha1w/sha1-openssl"]
+
 [dependencies]
 serde = {version = "1", features=["derive"]}
 buffers = {path = "../buffers"}
 clone_to_owned = {path = "../clone_to_owned"}
 anyhow = "1"
-sha1w = {path="../sha1w"}
+sha1w = {path="../sha1w", default-features=false}