Download/criu/3.2

Invisible files restore is de-serialized
VMAs restore performance is improved significantly
- Mappings of the same file re-use the descriptor, not re-open it every time
- Not-COW-ed mappings are restored in-place and are not mremmap()ed
- Empty RO mappings are mmap()ed as such and thus not re-mprotect()ed at the end
More verbosity in case TCP locking fails (#292)
More verbosity in case VDSO magic mismatch
Restore or legacy epoll target descriptors and fsnotify marks is unified with common case

Restoring fanotify marks from old images (<1.3) dropped the mark
Binfmt_misc mount could be mounted into wrong place
Compilation failed with gcc 6.3.0 (#315)
Waiting helpers could race with sigchild handler and would result in restore failure
Missing VVAR page in 32bit tasks wasn't skipped and resulted in restore failure