[MacPorts] #67287: rust-1.0 PortGroup: remap feature breaks build in some cases

[MacPorts]

#67287: rust-1.0 PortGroup: remap feature breaks build in some cases
------------------------+--------------------
  Reporter:  amake      |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  committed  |
------------------------+--------------------
Description changed by ryandesign:

Old description:

> The `rust.remap` feature was added in https://github.com/macports
> /macports-ports/commit/c61ef4ad76ea1f5079f74eb6525e07b0ee1f03d1; this
> causes `--remap-path-prefix` flags to be passed to rustc.
>
> This breaks building the committed port for some reason (see attached
> log). When the `--remap-path-prefix` flags are suppressed the build
> succeeds.

New description:

 The `rust.remap` feature was added in
 [c61ef4ad76ea1f5079f74eb6525e07b0ee1f03d1/macports-ports]; this causes
 `--remap-path-prefix` flags to be passed to rustc.

 This breaks building the committed port for some reason (see attached
 log). When the `--remap-path-prefix` flags are suppressed the build
 succeeds.

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Ticket URL: <https://trac.macports.org/ticket/67287#comment:2>
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