libavutil/riscv: Make use of elf_aux_info() on FreeBSD / OpenBSD riscv

libavutil/riscv: Make use of elf_aux_info() on FreeBSD / OpenBSD riscv

FreeBSD/OpenBSD riscv have elf_aux_info().

Signed-off-by: Brad Smith <brad@comstyle.com>
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>
(cherry picked from commit f3eca3f387)
Signed-off-by: Brad Smith <brad@comstyle.com>

libavutil/riscv/cpu.c

@@ -25,7 +25,7 @@
 #include "libavutil/log.h"
 #include "config.h"
 
-#if HAVE_GETAUXVAL
+#if HAVE_GETAUXVAL || HAVE_ELF_AUX_INFO
 #include <sys/auxv.h>
 #define HWCAP_RV(letter) (1ul << ((letter) - 'A'))
 #endif
@@ -84,7 +84,7 @@ int ff_get_cpu_flags_riscv(void)
             default:
         }
     }
-#elif HAVE_GETAUXVAL
+#elif HAVE_GETAUXVAL || HAVE_ELF_AUX_INFO
     {
         const unsigned long hwcap = ff_getauxval(AT_HWCAP);