Update ceph to 0.87

Straightforward upgrade, with a minor patch backported from 0.88 to fix a boost linker error.

Note that while the package is correctly upgraded, arch libc has a bug that will make ceph crash with SIGILL (illegal instruction) on non-Haswell intel CPUs, because libc incorrectly unconditionally uses an instruction from the TSX extension set. There's nothing the ceph package can do about this, I'm working with arch to get a fix rolled out. But if you install this package and find that `ceph` crashes on an illegal instruction, that's why. Ceph is fine, libc is borked.

https://bugzilla.redhat.com/show_bug.cgi?id=1146967 has more details on the libc TSX bug.