Commiting missing header file change from D2408773

Summary: AsyncSSLSocket.h change was not synced from D2408773 /
f7176051.

Test Plan: file matches D2408773

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folly/io/async/AsyncSSLSocket.h

@@ -450,6 +450,12 @@ class AsyncSSLSocket : public virtual AsyncSocket {
    */
   int getSSLVersion() const;
 
+  /**
+   * Get the signature algorithm used in the cert that is used for this
+   * connection.
+   */
+  const char *getSSLCertSigAlgName() const;
+
   /**
    * Get the certificate size used for this SSL connection.
    */