undefined reference to `htobe64'

Hi Everyone,

I'm working on a an older, CentOS 5, x86_64 machine. I use it for regression testing of some libraries. The machine provides GCC 4.1 and glibc 2.5, and the machine lacks `htobe64`, `be64toh`, `__builtin_bswap64` and friends.

I need some up to date tools on the old machine, and Unbound gets built as a dependency. Attempting a compile results in:

```
.libs/cachedb.o: In function `prep_data':
/home/jwalton/Build-Scripts/unbound-1.9.1/cachedb/cachedb.c:400: undefined reference to `htobe64'
/home/jwalton/Build-Scripts/unbound-1.9.1/cachedb/cachedb.c:401: undefined reference to `htobe64'
.libs/cachedb.o: In function `good_expiry_and_qinfo':
/home/jwalton/Build-Scripts/unbound-1.9.1/cachedb/cachedb.c:424: undefined reference to `be64toh'
.libs/cachedb.o: In function `parse_data':
/home/jwalton/Build-Scripts/unbound-1.9.1/cachedb/cachedb.c:484: undefined reference to `be64toh'
/home/jwalton/Build-Scripts/unbound-1.9.1/cachedb/cachedb.c:485: undefined reference to `be64toh'
collect2: ld returned 1 exit status
gmake: *** [unbound-checkconf] Error 1
Failed to build Unbound
```

You might want to use a `TRY_LINK` test (not a `TRY_COMPILE` test) for `htobe64` and `be64toh` since missing symbols may not cause a compile failure.

*Update*: I was testing an older version of Unbound. If this has been fixed, please close/delete this report.

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