[MacPorts] #65815: ffcall @2.4: fails to build on M1

[MacPorts]

#65815: ffcall @2.4: fails to build on M1
-----------------------+--------------------
 Reporter:  andrewcox  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:
 Keywords:             |       Port:
-----------------------+--------------------
 Not 100% this is M1 related, but I am able to build this on my x86_64 mac,
 and not able to build on M1.

 Failure happens in configure, and looks like this:

 {{{
 configure:23136: result: cannot detect
 configure:23140: error: in
 `/opt/mports/var/macports/build/_opt_mports_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_ffcall/ffcall/work/libffcall-2.4':
 configure:23142: error: cannot make /usr/bin/clang report undeclared
 builtins
 See `config.log' for more details
 }}}

 Full log here https://pastebin.com/88c2ztZy

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Ticket URL: <https://trac.macports.org/ticket/65815>
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