PR: 260255
Reported by: portscout
1. fexcept_t is available on FreeBSD via fenv.h. 2. new_g and new_rad in core_commands6.cc actually need signed char. 3. Add FreeBSD's names for ARM and POWER to build-intel-lib.sh. PR: 254556 Approved by: yuri (maintainer)
Approved by: tcberner (mentor) Differential Revision: https://reviews.freebsd.org/D13177