Update to 1.3.6
    
    - New upstream release 1.3.6 (see NEWS for details)
    - Update mod_vroot to 0.9.5 (API compatibility with 1.3.6)
    - Add upstream fixes for flaky API tests
      (https://github.com/proftpd/proftpd/issues/483)
      (https://github.com/proftpd/proftpd/pull/510)
      (https://github.com/proftpd/proftpd/pull/514)
    - Add functionality to disable external network tests
      (https://github.com/proftpd/proftpd/pull/497)
    - Update template TLS configuration
    - PCRE 7.0 always available for use now
    - Disable PCRE support for now as JIT compiler has SELinux issues
      (https://bugs.exim.org/show_bug.cgi?id=1749)
    - Update proftpd.service to use Type=simple rather than Type=forking
      (https://github.com/proftpd/proftpd/pull/506)
    - Remove redundant bind() to controls socket
      (https://github.com/proftpd/proftpd/issues/501)
    - Fix similars functionality and unit test
      (https://github.com/proftpd/proftpd/pull/513)
    - Integration tests can use system Test::Unit now
    - tcpd.h can always be found in tcp_wrappers-devel now