[MacPorts] #74343: blt: build fails under -std=gnu23 due to K&R C syntax removal in C23

[MacPorts]

#74343: blt: build fails under -std=gnu23 due to K&R C syntax removal in C23
---------------------------------------------+--------------------
 Reporter:  EkanshWadhwa39                   |      Owner:  (none)
     Type:  defect                           |     Status:  new
 Priority:  Normal                           |  Milestone:
Component:  ports                            |    Version:
 Keywords:  blt C23 gnu17 K&R build failure  |       Port:  blt
---------------------------------------------+--------------------
 BLT uses K&R-style C function declarations (parameters typed separately
   after the signature), which were fully removed in C23. MacPorts now
   defaults to -std=gnu23 on macOS 26 Tahoe, causing hard parse errors:

     bltUtil.c:47:1: error: parameter names without types
     Blt_Calloc(nElems, sizeOfElem)
         int nElems;
         size_t sizeOfElem;

   Fix: add the following line to the blt Portfile after
 `use_parallel_build no`:

     configure.cflags-append -std=gnu17

   C17 retains K&R support as legacy. Tested on macOS 26.5.1 Tahoe,
   Apple Silicon M4, MacPorts 2.12.4.

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Ticket URL: <https://trac.macports.org/ticket/74343>
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