databases/mysqlwsrep56-server: Upgrade from 5.6.35_1 to 5.6.36

• Change maintainer from info@galeracluster.com to devel@galeracluster.com for consistency with databases/galera
• Fetch the source code from GitHub
• Remove patches that have been included upstream (files/patch-client_mysql.cc, files/patch-cmake_readline.cmake)