[MacPorts] #44172: libffi: missing build dependencies

[MacPorts]

#44172: libffi: missing build dependencies
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  Reporter:  ionic@…  |      Owner:  macports-tickets@…
      Type:  defect   |     Status:  new
  Priority:  Low      |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  libffi   |
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Comment (by ionic@…):

 I have "determined" those dependencies by building `libffi` in trace mode.

 Those are the violations that popped up.

 Even though `libffi` built fine even without them, some of them may better
 be added to make it happy/not lose functionality in trace mode.

 I guess `port:autoconf` and `port:automake` should be added as build
 dependencies.

 `gsed`, `coreutils`, `grep` and `cctools` are redundant (the system-
 provided tools will work just fine.)

 I probably have to take a closer look at how exactly `autoconf`,
 `automake` and `texinfo` are being used during the build process exactly
 and decide once I know more.

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Ticket URL: <https://trac.macports.org/ticket/44172#comment:6>
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