[MacPorts] #72547: cctools: build vtool too

[MacPorts]

#72547: cctools: build vtool too
-------------------------+---------------------
 Reporter:  RJVB         |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:  haspatch     |       Port:  cctools
-------------------------+---------------------
 Using a (hotpatched) current rust toolchain on OS X < 10.12 gives binaries
 that have `LC_VERSION_MIN_MACOSX` set to 10.12 even if you add `-mmacosx-
 min-version 10.x` to C(XX)FLAGS.

 This can be corrected with vtool, but that utility isn't available on the
 systems concerned.

 The attached patch enables building the tool, and backports a few required
 fixes from cctools 1010 (plus addresses the oversight that an unsigned
 buffer length variable cannot become negative but will go huge instead,
 leading to a crash).

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Ticket URL: <https://trac.macports.org/ticket/72547>
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