guile-ssh-0.11.3-bp156.3.13

- set libssh minimum version to 0.6.4

- enable the libssh_threads patch also on Leap/SLE 15.1, as
  libssh_threads is there also in libssh

- don't link against libssh_threads anymore, as it gots removed in
  libssh 0.8. gh#artyom-poptsov/guile-ssh#9
  Add and use it on Tumbleweed and Factory:
  * 0001-libguile-ssh-Remove-ssh_threads-from-LDFLAGS.patch

- correct installation of info files

- Update summaries.

- libguile-ssh subpackage for shared libraries
- devel depend on libguile-ssh
- improve descriptions
- install example scripts to correct place and make them executable
- don't install static library
- install info file

- inital version of guile-ssh 0.11.3