[Bug 280783] math/blis: fix build with clang 19

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280783

            Bug ID: 280783
           Summary: math/blis: fix build with clang 19
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: jmd@freebsd.org
          Reporter: dim@FreeBSD.org
          Assignee: jmd@freebsd.org
             Flags: maintainer-feedback?(jmd@freebsd.org)

Clang 19 has removed support for the -mavx512pf and -mavx512er flags,
for the Intel Xeon Phi (aka "Knights Landing"/knl or "Knights
Mill"/knm) [1] [2].

This causes fatal errors during configuration of math/blis:

    Compiling obj/x86_64/kernels/knl/1m/bli_dpackm_knl_asm_24x8.o ('knl' CFLAGS
for kernels)
    cc: fatal error: unknown argument '-mavx512pf'; did you mean '-mavx512f'?
    gmake: *** [Makefile:653:
obj/x86_64/kernels/knl/1m/bli_dpackm_knl_asm_24x8.o] Error 1

Add an EXTRA_PATCHES entry to deal with this situation.

Note that in the future, this may also have to be done for gcc 15 and
later. In that case, the patch might be done unconditionally.

[1] https://github.com/llvm/llvm-project/pull/75580
[2] https://github.com/llvm/llvm-project/pull/92883

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