Revert "Disable MDC2 by default."

This reverts commit ca1574ce.
Not suitabled for a minor release as it breaks the ABI.
Reviewed-by: NRichard Levitte <levitte@openssl.org>

.travis.yml

@@ -28,7 +28,7 @@ compiler:
 
 env:
     - CONFIG_OPTS="" DESTDIR="_install"
-    - CONFIG_OPTS="--debug no-shared enable-crypto-mdebug enable-rc5 enable-md2 enable-mdc2"
+    - CONFIG_OPTS="--debug no-shared enable-crypto-mdebug enable-rc5 enable-md2"
     - CONFIG_OPTS="no-pic --strict-warnings" BUILDONLY="yes"
     - CONFIG_OPTS="no-engine no-shared --strict-warnings" BUILDONLY="yes"
     - CONFIG_OPTS="no-stdio --strict-warnings" BUILDONLY="yes"
@@ -37,7 +37,7 @@ matrix:
     include:
         - os: linux
           compiler: gcc
-          env: CONFIG_OPTS="--debug --coverage no-asm enable-rc5 enable-md2 enable-mdc2 enable-ec_nistp_64_gcc_128 enable-ssl3 enable-ssl3-method enable-nextprotoneg enable-weak-ssl-ciphers" COVERALLS="yes"
+          env: CONFIG_OPTS="--debug --coverage no-asm enable-rc5 enable-md2 enable-ec_nistp_64_gcc_128 enable-ssl3 enable-ssl3-method enable-nextprotoneg enable-weak-ssl-ciphers" COVERALLS="yes"
         - os: linux
           compiler: clang-3.6
           env: CONFIG_OPTS="enable-msan"
@@ -46,10 +46,10 @@ matrix:
           env: CONFIG_OPTS="no-asm enable-ubsan enable-rc5 enable-md2 enable-ssl3 enable-ssl3-method enable-nextprotoneg -fno-sanitize=alignment"
         - os: linux
           compiler: clang-3.6
-          env: CONFIG_OPTS="no-asm enable-asan enable-rc5 enable-md2 enable-mdc2"
+          env: CONFIG_OPTS="no-asm enable-asan enable-rc5 enable-md2"
         - os: linux
           compiler: gcc-5
-          env: CONFIG_OPTS="no-asm enable-ubsan enable-rc5 enable-md2 enable-mdc2 -DPEDANTIC"
+          env: CONFIG_OPTS="no-asm enable-ubsan enable-rc5 enable-md2 -DPEDANTIC"
         - os: linux
           compiler: i686-w64-mingw32-gcc
           env: CONFIG_OPTS="no-stdio" BUILDONLY="yes"

CHANGES

@@ -4,8 +4,7 @@
 
  Changes between 1.1.0a and 1.1.1 [xx XXX xxxx]
 
-  *) MDC2 is now disabled by default.
-     [Rich Salz]
+  *)
 
   *) 'openssl passwd' can now produce SHA256 and SHA512 based output,
      using the algorithm defined in

Configure

@@ -433,7 +433,6 @@ our %disabled = ( # "what"         => "comment"
 		  "fuzz-afl"		=> "default",
 		  "heartbeats"          => "default",
 		  "md2"                 => "default",
-		  "mdc2"                => "default",
                   "msan"                => "default",
 		  "rc5"                 => "default",
 		  "sctp"                => "default",

INSTALL

@@ -474,12 +474,12 @@
 
   enable-<alg>
                    Build with support for the specified algorithm, where <alg>
-                   is one of: md2, mdc2, or rc5.
+                   is one of: md2 or rc5.
 
   no-<alg>
                    Build without support for the specified algorithm, where
                    <alg> is one of: bf, blake2, camellia, cast, chacha, cmac,
-                   des, dh, dsa, ecdh, ecdsa, idea, md4, ocb, poly1305,
+                   des, dh, dsa, ecdh, ecdsa, idea, md4, mdc2, ocb, poly1305,
                    rc2, rc4, rmd160, scrypt, seed or whirlpool. The "ripemd"
                    algorithm is deprecated and if used is synonymous with rmd160.