fix: forward curl rustls feature from gix-transport to avoid `cur…

…l` in `gix`. (Byron#1328)

This removes the `curl` dependency just for configuring it, and removes
a hazard which became evident with reqwest.

gix-transport/Cargo.toml

@@ -30,6 +30,8 @@ http-client = [
 ]
 ## Implies `http-client`, and adds support for the http and https transports using the Rust bindings for `libcurl`.
 http-client-curl = ["curl", "http-client"]
+## Implies `http-client-curl` and enables `rustls` for creationg `https://` connections.
+http-client-curl-rust-tls = ["http-client-curl", "curl/rustls"]
 ### Implies `http-client` and adds support for http and https transports using the blocking version of `reqwest`.
 http-client-reqwest = ["reqwest", "http-client"]
 ## Stacks with `blocking-http-transport-reqwest` and enables `https://` via the `rustls` crate.

gix/Cargo.toml

@@ -169,8 +169,7 @@ blocking-http-transport-curl = [
 ## Stacks with `blocking-http-transport-curl` and also enables the `rustls` backend to avoid `openssl`.
 blocking-http-transport-curl-rustls = [
     "blocking-http-transport-curl",
-    "dep:curl",
-    "curl?/rustls",
+    "gix-transport/http-client-curl-rust-tls",
 ]
 ## Stacks with `blocking-network-client` to provide support for HTTP/S using **reqwest**, and implies blocking networking as a whole, making the `https://` transport available.
 blocking-http-transport-reqwest = [
@@ -364,9 +363,6 @@ serde = { version = "1.0.114", optional = true, default-features = false, featur
 smallvec = "1.9.0"
 async-std = { version = "1.12.0", optional = true }
 
-# Used for feature-configuration only.
-curl = { workspace = true, optional = true }
-
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