[MacPorts] #54026: readline upgrade breaks various ports

[MacPorts]

#54026: readline upgrade breaks various ports
--------------------+-----------------
 Reporter:  jimjag  |      Owner:
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:
--------------------+-----------------
 The upgrade of readline to @7.0.003 breaks the following ports (at least):

   gawk @4.1.4

   gdbm @1.13

   gnupg @1.4.21

   gnupg2 @2.0.30

   ghostscript @9.21+x11

 Note that these expect readline6, as shown in the config log:

 :info:configure configure: creating ./config.status
 :info:configure config.status: creating Makefile
 :info:configure dyld: Library not loaded:
 /usr/local/lib/libreadline.6.dylib
 :info:configure   Referenced from: /usr/local/bin/gawk
 :info:configure   Reason: image not found
 :info:configure sed: stdout: Broken pipe
 :info:configure ./config.status: line 1100: 67446 Done(1)
 eval sed \"\$ac_sed_extra\" "$ac_file_inputs"

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Ticket URL: <https://trac.macports.org/ticket/54026>
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