[Bug 277636] archivers/unrar build error on arm64 with hardware CRC or AES

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277636

            Bug ID: 277636
           Summary: archivers/unrar build error on arm64 with hardware CRC
                    or AES
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: sunpoet@FreeBSD.org
          Reporter: jfc@mit.edu
             Flags: maintainer-feedback?(sunpoet@FreeBSD.org)
          Assignee: sunpoet@FreeBSD.org

Make /etc/make.conf has

  CPUTYPE?=cortex-a57

This causes a build error in archivers/unrar:

  ===>  Building for unrar-7.00,6
  c++ -DOPENSSL_AES -I/usr/include -O2 -pipe -mcpu=cortex-a57
-fstack-protector-strong -fno-strict-aliasing   -D_FILE_OFFSET_BITS=64
-D_LARGEFILE_SOURCE -DRAR_SMP -DUNRAR -c rar.cpp
  In file included from rar.cpp:1:
  In file included from ./rar.hpp:6:
  ./os.hpp:158:10: fatal error: 'asm/hwcap.h' file not found
    158 | #include <asm/hwcap.h>
        |          ^~~~~~~~~~~~~
  1 error generated.
  *** Error code 1

My CPU setting enables the __ARM_FEATURE macros tested in this part of os.hpp
added in unrar7.

  #if defined(__aarch64__) && (defined(__ARM_FEATURE_CRYPTO) ||
defined(__ARM_FEATURE_CRC32))
  #include <arm_neon.h>
  #ifndef _APPLE
  #include <sys/auxv.h>
  #include <asm/hwcap.h>
  #endif
  #ifdef __ARM_FEATURE_CRYPTO
  #define USE_NEON_AES
  #endif
  #ifdef __ARM_FEATURE_CRC32
  #define USE_NEON_CRC32
  #endif
  #endif

The header file assumes the 64 bit world consists entirely of Apple and Linux.

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