Fix build on LibreSSL.

LibreSSL has deprecated SSLv3_method, so this commit makes that a compile-time
feature.

It also removes a test referencing SSL_OP_CISCO_ANYCONNECT, as the LibreSSL
header says it is amongst "Obsolete flags kept for compatibility. No sane code
should use them."

openssl-sys/Cargo.toml

@@ -17,6 +17,7 @@ tlsv1_1 = []
 dtlsv1 = []
 dtlsv1_2 = []
 sslv2 = []
+sslv3 = []
 aes_xts = []
 aes_ctr = []
 npn = []

openssl/src/ssl/mod.rs

@@ -109,6 +109,7 @@ pub enum SslMethod {
     /// Support the SSLv2, SSLv3, TLSv1, TLSv1.1, and TLSv1.2 protocols depending on what the
     /// linked OpenSSL library supports.
     Sslv23,
+    #[cfg(feature = "sslv3")]
     /// Only support the SSLv3 protocol.
     Sslv3,
     /// Only support the TLSv1 protocol.
@@ -132,6 +133,7 @@ impl SslMethod {
         match *self {
             #[cfg(feature = "sslv2")]
             SslMethod::Sslv2 => ffi::SSLv2_method(),
+            #[cfg(feature = "sslv3")]
             SslMethod::Sslv3 => ffi::SSLv3_method(),
             SslMethod::Tlsv1 => ffi::TLSv1_method(),
             SslMethod::Sslv23 => ffi::SSLv23_method(),
@@ -150,6 +152,7 @@ impl SslMethod {
         match method {
             #[cfg(feature = "sslv2")]
             x if x == ffi::SSLv2_method() => Some(SslMethod::Sslv2),
+            #[cfg(feature = "sslv3")]
             x if x == ffi::SSLv3_method() => Some(SslMethod::Sslv3),
             x if x == ffi::TLSv1_method() => Some(SslMethod::Tlsv1),
             x if x == ffi::SSLv23_method() => Some(SslMethod::Sslv23),

openssl/src/ssl/tests.rs

@@ -416,10 +416,6 @@ run_test!(set_ctx_options, |method, _| {
     let mut ctx = SslContext::new(method).unwrap();
     let opts = ctx.set_options(ssl::SSL_OP_NO_TICKET);
     assert!(opts.contains(ssl::SSL_OP_NO_TICKET));
-    assert!(!opts.contains(ssl::SSL_OP_CISCO_ANYCONNECT));
-    let more_opts = ctx.set_options(ssl::SSL_OP_CISCO_ANYCONNECT);
-    assert!(more_opts.contains(ssl::SSL_OP_NO_TICKET));
-    assert!(more_opts.contains(ssl::SSL_OP_CISCO_ANYCONNECT));
 });
 
 run_test!(clear_ctx_options, |method, _| {