Use FreeBSD's elf_aux_info for detecting ARM HW features
* configure.ac: Add function check for 'elf_aux_info'. * src/hwf-arm.c [HAVE_ELF_AUX_INFO]: Include 'sys/auxv.h'. [HAVE_ELF_AUX_INFO && !HAVE_GETAUXVAL] (HAVE_GETAUXVAL) (getauxval): New.
- Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>