[MacPorts] #71894: macOS 15.2 failing to build llvm-devel due to xar failure

[MacPorts]

#71894: macOS 15.2 failing to build llvm-devel due to xar failure
------------------------+------------------------
 Reporter:  VariantXYZ  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.10.5
 Keywords:  sequoia     |       Port:  llvm-devel
------------------------+------------------------
 ```
 :info:build src/xar.c:678:11: error: implicit declaration of function
 'xar_prop_get_expect_notnull' is invalid in C99 $
 :info:build         if( 0 != xar_prop_get_expect_notnull((xar_file_t)x,
 "checksum/offset" ,&value) ) {
 :info:build                  ^
 :info:build 1 error generated.
 ```

 Related: https://trac.macports.org/ticket/71162

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Ticket URL: <https://trac.macports.org/ticket/71894>
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