[MacPorts] #74412: dtc 1.7.2: FTBS with a long custom macports root

[MacPorts]

#74412: dtc 1.7.2: FTBS with a long custom macports root
--------------------------------+--------------------
 Reporter:  marcingomulkiewicz  |      Owner:  (none)
     Type:  defect              |     Status:  new
 Priority:  Normal              |  Milestone:
Component:  ports               |    Version:  2.12.6
 Keywords:  haspatch            |       Port:  dtc
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 Fails to build from source when custom macports location is (too) long.
 MacOS 26.6.2

 Cause: dtc's Makefile links libfdt.dylib.1 with a relative install name
 and relies on $(LDFLAGS), but MacPorts only exports LDFLAGS (with
 -Wl,-headerpad_max_install_names) to the configure phase — and this port
 uses a no-op configure (configure.cmd echo) with a custom build.cmd. So
 the dylib is linked without header padding, and post-destroot's
 install_name_tool -id (Portfile:41) cannot fit the long install name
 /my/own/very/long/path/to/macports/lib/libfdt.dylib.1. With the default
 /opt/local prefix it fits, which is why the custom location fails.

 Potential quick fix, verified locally: add the flag to the link step in
 Portfile:35:

 build.cmd  gmake V=1 NO_PYTHON=1 LDFLAGS=-Wl,-headerpad_max_install_names
 "PREFIX=${destroot}${prefix}" install

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Ticket URL: <https://trac.macports.org/ticket/74412>
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