Merge branch 'jk/unleak-mmap'

Merge branch 'jk/unleak-mmap'

Plug a few leaks where mmap'ed memory regions are not unmapped.

* jk/unleak-mmap:
  meson: turn on NO_MMAP when building with LSan
  Makefile: turn on NO_MMAP when building with LSan
  object-file: fix mmap() leak in odb_source_loose_read_object_stream()
  pack-revindex: avoid double-loading .rev files
  check_connected(): fix leak of pack-index mmap
  check_connected(): delay opening new_pack