Fix compilation with specified minimal versions (#503)

Verified with `cargo +nightly test -Zminimal-versions`.

Author: alex

Cargo.toml

@@ -23,7 +23,7 @@ socket2 = "0.5.0"
 
 # Unix platforms use OpenSSL for now to provide SSL functionality
 [target.'cfg(all(unix, not(target_os = "macos")))'.dependencies]
-openssl-sys = { version = "0.9.43", optional = true }
+openssl-sys = { version = "0.9.64", optional = true }
 openssl-probe = { version = "0.1.2", optional = true }
 
 [target.'cfg(target_env = "msvc")'.dependencies]

curl-sys/Cargo.toml

@@ -30,7 +30,7 @@ optional = true
 features = ["no_log_capture"]
 
 [target.'cfg(all(unix, not(target_os = "macos")))'.dependencies]
-openssl-sys = { version = "0.9", optional = true }
+openssl-sys = { version = "0.9.64", optional = true }
 
 [target.'cfg(windows)'.dependencies]
 winapi = { version = "0.3", features = ["winsock2", "ws2def"] }