Fix double declaration of getauxval() for FreeBSD PPC

[mcmilk]

The extern declaration is only for Linux, move this line into the right #ifdef section.

Signed-off-by: Tino Reichardt milky-zfs@mcmilk.de
Closes: 13934

Motivation and Context

Description

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance enhancement (non-breaking change which improves efficiency)
• Code cleanup (non-breaking change which makes code smaller or more readable)
• Breaking change (fix or feature that would cause existing functionality to change)
• Library ABI change (libzfs, libzfs_core, libnvpair, libuutil and libzfsbootenv)
• Documentation (a change to man pages or other documentation)

Checklist:

• My code follows the OpenZFS code style requirements.
• I have updated the documentation accordingly.
• I have read the contributing document.
• I have added tests to cover my changes.
• I have run the ZFS Test Suite with this change applied.
• All commit messages are properly formatted and contain Signed-off-by.

[mmatuska]

To fix the complete build we need more:

in include/os/freebsd/spl/sys/simd_powerpc.h:

1. there is no <powerpc/cpu.h>, you want <machine/cpu.h>
   or does the build system provide otherwise? In FreeBSD base we need <machine/cpu.h>
2. you are missing an #endif at the end of the file

zfs/include/os/freebsd/spl/sys/simd_powerpc.h

Lines 49 to 90 in c629f0b

	#ifndef _FREEBSD_SIMD_POWERPC_H
	#define _FREEBSD_SIMD_POWERPC_H
	#include <sys/types.h>
	#include <sys/cdefs.h>
	#include <machine/pcb.h>
	#include <powerpc/cpu.h>
	#define kfpu_allowed() 1
	#define kfpu_initialize(tsk) do {} while (0)
	#define kfpu_begin() do {} while (0)
	#define kfpu_end() do {} while (0)
	#define kfpu_init() (0)
	#define kfpu_fini() do {} while (0)
	/*
	* Check if Altivec is available
	*/
	static inline boolean_t
	zfs_altivec_available(void)
	{
	return ((cpu_features & PPC_FEATURE_HAS_ALTIVEC) != 0);
	}
	/*
	* Check if VSX is available
	*/
	static inline boolean_t
	zfs_vsx_available(void)
	{
	return ((cpu_features & PPC_FEATURE_HAS_VSX) != 0);
	}
	/*
	* Check if POWER ISA 2.07 is available (SHA2)
	*/
	static inline boolean_t
	zfs_isa207_available(void)
	{
	return ((cpu_features2 & PPC_FEATURE2_ARCH_2_07) != 0);
	}

[behlendorf]

@mmatuska once you're certain this PR is sufficient to resolve the build issue can you please approve it. Then I'll know it's ready to merge.

[mmatuska]

@behlendorf I approve the PR, we have it already in FreeBSD base