This switches the Linux crash handler to use addr2line when it
is available. Addr2line is much better at converting addresses
into readable information. The downside is that we must use a
system call to a binary since it's not easy to integrate with
addr2line source.

Bug: angleproject:5239
Change-Id: I13cbaa4ba30166718fb12d924c76ba4f2675453c
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2515265Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Tim Van Patten <timvp@google.com>