[MacPorts] #67222: clang-13 @13.0.1_3 does not build on 10.11.6 (El Capitan)

[MacPorts]

#67222: clang-13 @13.0.1_3 does not build on 10.11.6 (El Capitan)
-----------------------+----------------------
 Reporter:  snowflake  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:
 Keywords:             |       Port:  clang-13
-----------------------+----------------------
 Confirmed by the buildbots:

 https://build.macports.org/builders/ports-10.11_x86_64-builder/builds/216803

 I did not spot any errors, but there was this warning just before the
 build giving up:

 {{{
 ld: warning: object file (/opt/local
 /lib/libMacportsLegacySupport.a(macports_legacy_os_unfair_lock.o)) was
 built for newer OSX version (10.11) than being linked (10.10)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/67222>
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