x11/babl: fix build on armv7

PR:	264942
Submitted by:	Robert Clausecker

x11/babl/files/patch-babl_babl-cpuaccel.c

@@ -0,0 +1,43 @@
+--- babl/babl-cpuaccel.c.orig	2022-06-28 12:20:06 UTC
++++ babl/babl-cpuaccel.c
+@@ -556,33 +556,19 @@ arch_accel (void)
+ #include <fcntl.h>
+ #include <string.h>
+ #include <elf.h>
++#include <sys/auxv.h>
+
+ #define HAVE_ACCEL 1
+
+ static guint32
+ arch_accel (void)
+ {
+-  /* TODO : add or hardcode the other ways it can be on arm, where
+-   *        this info comes from the system and not from running cpu
+-   *        instructions
+-   */
+-  int has_neon = 0;
+-  int fd = open ("/proc/self/auxv", O_RDONLY);
+-  Elf32_auxv_t auxv;
+-  if (fd >= 0)
+-  {
+-    while (read (fd, &auxv, sizeof (Elf32_auxv_t)) == sizeof (Elf32_auxv_t))
+-    {
+-      if (auxv.a_type == AT_HWCAP)
+-      {
+-        if (auxv.a_un.a_val & 4096)
+-          has_neon = 1;
+-      }
+-    }
+-    close (fd);
+-  }
+-  return has_neon?BABL_CPU_ACCEL_ARM_NEON:0;
+-}
++	unsigned long hwcap = 0;
++
++	elf_aux_info(AT_HWCAP, &hwcap, sizeof hwcap);
++
++	return hwcap & HWCAP_NEON ? BABL_CPU_ACCEL_ARM_NEON : 0;
++}	
+
+ #endif /* ARCH_ARM  */
+