Above feature macro is needed on glibc 2.17 era, in order to activate ftw* related functions/macros.

replay most recent event too

* master:
  refactors u3m_reclaim, plugging memory leaks
  reclaim memory on kernel reset
  reclaim memory on restart
  adds u3m_reclaim to clear persistent caches in vere
  adds -Dmemory-log=true build option to save |mass output to a file
  threads output file pointer through memory marking and printing
  [CI] run |mass after +test
  fixes |mass, unifying the implementation with u3m_grab()
  refactors and clarifies heuristic printing of an allocation box
  adds comment explaining u3a_minimum
  refactors memory leak printfs in u3a_sweep()
  refactors libnoun memory marking, adds optional printfs

print error messages on boot failure due to bad pill

fixes dead link to swap instructions

no-op in ames.c if no galaxy domain

Since it now contains a glibc feature macro, it needs to be included
ahead of normal glibc headers, so vere/unix.c now starts with #include
"all.h".

vere/unix.c: set _XOPEN_SOURCE

cleans up vere GC call sites, runs once after event

prepare hotfix branch for release