[MacPorts] #58647: github portgroup: possible worksrcdir mismatch for ports with `github.tarball_from archive`

[MacPorts]

#58647: github portgroup: possible worksrcdir mismatch for ports with
`github.tarball_from archive`
----------------------+--------------------
 Reporter:  yan12125  |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  github
----------------------+--------------------
 For example, in port py-curl, I use the following lines to utilize the
 github portgroup:

 {{{
 github.setup        pycurl pycurl 7_43_0_3 REL_
 github.tarball_from archive
 }}}

 In the downloaded tarball, the top level directory is `pycurl-
 REL_7_43_0_3`, while the value of `worksrcdir`, which is set to `distname`
 as usual, is `${github.project}-${github.version}`, or `pycurl-7_43_0_3`
 (`REL_` prefix is gone). For MacPorts 2.5.4, such a mismatch leads to
 build failures like (1). For MacPorts git-master, building py-curl is OK
 as a symlink will be created in certain scenarios (2). I consider (2) a
 workaround, and worksrcdir should be fixed in the github portgroup. A
 possible solution is using `worksrcdir ${github.project}-${git.branch}`
 for ports using `github.tarball_from archive`.

 (1)
 https://build.macports.org/builders/ports-10.14_x86_64-builder/builds/33145/steps
 /install-port/logs/stdio

 (2) https://github.com/macports/macports-base/pull/55

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Ticket URL: <https://trac.macports.org/ticket/58647>
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