[MacPorts] #60854: Wrong subversion dependency when fetch.type is svn on Catalina

[MacPorts]

#60854: Wrong subversion dependency when fetch.type is svn on Catalina
------------------------+--------------------
 Reporter:  ryandesign  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  base        |    Version:  2.6.2
 Keywords:              |       Port:
------------------------+--------------------
 When `fetcy.type` is `svn`, MacPorts base declares a dependency on
 `bin:svn:subversion`. On Catalina with only the command line tools
 installed, /usr/bin/svn exists but is a stub that doesn't do anything:

 {{{
 :info:fetch svn: error: The subversion command line tools are no longer
 provided by Xcode.
 }}}

 We already change the dependency to `port:subversion` on old OS versions
 whose svn can't connect to secure servers anymore. We should also do this
 when on a new system with a stub svn.

-- 
Ticket URL: <https://trac.macports.org/ticket/60854>
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