[MacPorts] #52092: mp-buildbot: use tools curl instead of macOS curl

[MacPorts]

#52092: mp-buildbot: use tools curl instead of macOS curl
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 Reporter:  ryandesign@…  |      Owner:  macports-tickets@…
     Type:  enhancement   |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  contrib       |    Version:
 Keywords:                |       Port:
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 mpbb-gather-archives currently hardcodes:
 {{{
     curl=/usr/bin/curl
 }}}
 I'd like this to use the curl installed in the tools prefix instead.
 /usr/bin/curl on Leopard can't understand our SSL certificate.

 The way that mpbb-checkout uses the tools svn is via a `--svn` flag. To
 use the tools curl, do we need to add a `--curl` flag?

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Ticket URL: <https://trac.macports.org/ticket/52092>
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