tests fail if COMPAT_HAS_MMAN_AND_PAGESIZE is not set
tor_mmap_file
doesn't check for empty files if COMPAT_HAS_MMAN_AND_PAGESIZE
is not set, causes test_util_mmap
to fail
tor_mmap_file
doesn't check for empty files if COMPAT_HAS_MMAN_AND_PAGESIZE
is not set, causes test_util_mmap
to fail