Fix feature gated sslv3

.travis.yml

@@ -9,7 +9,7 @@ os:
 - linux
 env:
   global:
-    - FEATURES="tlsv1_2 tlsv1_1 dtlsv1 dtlsv1_2 sslv2 aes_xts npn alpn aes_ctr"
+    - FEATURES="tlsv1_2 tlsv1_1 dtlsv1 dtlsv1_2 sslv2 sslv3 aes_xts npn alpn aes_ctr"
 before_install:
 - (test $TRAVIS_OS_NAME == "osx" || ./openssl/test/build.sh)
 script:

openssl/Cargo.toml

@@ -15,6 +15,7 @@ tlsv1_1 = ["openssl-sys/tlsv1_1"]
 dtlsv1 = ["openssl-sys/dtlsv1"]
 dtlsv1_2 = ["openssl-sys/dtlsv1_2"]
 sslv2 = ["openssl-sys/sslv2"]
+sslv3 = ["openssl-sys/sslv3"]
 aes_xts = ["openssl-sys/aes_xts"]
 aes_ctr = ["openssl-sys/aes_ctr"]
 npn = ["openssl-sys/npn"]