1.4.4: broken on big endian architectures

[ThomasWaldmann]

In the new header value validation code, due to missing _le32toh() calls for num_buckets and num_entries, it crashes with this on big endian architectures, like s390x, hppa, sparc64:

E   ValueError: Expected 0 <= num_entries <= num_buckets, got 1660944384.

• https://buildd.debian.org/status/fetch.php?pkg=borgbackup&arch=s390x&ver=1.4.4-1&stamp=1773924854&raw=0

• https://buildd.debian.org/status/fetch.php?pkg=borgbackup&arch=sparc64&ver=1.4.4-1&stamp=1773926302&raw=0

[ThomasWaldmann]

Fixes (apply these patches AFTER the ones from #9485):

• 1.4-maint (needed for <= 1.4.4!): hashindex: fix new checks for big endian archs, fixes #9521 #9522
• 1.2-maint: hashindex: fix new checks for big endian archs, fixes #9521 #9523
• 1.1-maint: hashindex: fix new checks for big endian archs, fixes #9521 #9524

[ThomasWaldmann]

@FelixSchwarz @LocutusOfBorg @bket Yet another patch, see previous post.

[ThomasWaldmann]

Fixed, does not apply to master branch.

[LocutusOfBorg]

thanks!