Make _Unwind_GetIP, _Unwind_GetIPInfo and _Unwind_SetIP available as functions
for arm*-*-freebsd*.
This patch is already pushed upstream to all active gcc branches.
GCC-5, GCC-6, GCC-7 and trunk. The gcc?-devel ports will catch up these bits
with the next update.
Once a new release for gcc6 or gcc5 is done, this patch will be obsolete.

Approved by: gerald@ (maintainer)