GCC7 also checks -fsanitize=divide-by-zero, which generates a trap
and in sh4, traps in rtld result in link failure. Pull the fix from
upstream, although it is not a complete fix, I think: this still
generates a trap (SIGILL) rather than the intended SIGFPE.
Signed-off-by: Alexey Neyman <stilor@att.net>
