Add build check for OpenSSL 1.1.1 requirement

components/net/build.rs

@@ -0,0 +1,16 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+fn main() {
+    let version =
+        std::env::var("DEP_OPENSSL_VERSION_NUMBER").expect("missing DEP_OPENSSL_VERSION_NUMBER");
+    let actual = u64::from_str_radix(&version, 16).unwrap();
+    let minimum = 0x10101000;
+    if actual < minimum {
+        panic!(
+            "Your OpenSSL version is older than 1.1.1 ({:x}), you have: {:x}",
+            minimum, actual
+        );
+    }
+}