[MacPorts] #60439: mod_gnutls requires Python module yaml

[MacPorts]

#60439: mod_gnutls requires Python module yaml
-----------------------+-------------------------
 Reporter:  snowflake  |      Owner:  Schamschula
     Type:  defect     |     Status:  assigned
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.6.99
 Keywords:             |       Port:  mod_gnutls
-----------------------+-------------------------
 mod_gnutls is not building on any of the buildbots bar one.

 The error in the configure phase is:
 {{{
 checking python3.8 module: yaml... no
 configure: error: failed to find required module yaml
 }}}
 I installed ```py38-yaml``` and it then built.

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Ticket URL: <https://trac.macports.org/ticket/60439>
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