contrib: upnp: update to 1.14.15

This pupnp release address some win32 issues reported after we bumped to
1.14.

Removed patches:
- 0001-ThreadPool-[...].patch -> Fixed upstream by d4cfec4674c6877bad350
- win32-remove-wro[...].patch -> Fixed upstream by d86f4159e13d00a9eb59a

This release also fixes an XML descriptor parsing error:
<https://github.com/pupnp/pupnp/issues/412>
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