db: change types to avoid headers changing between architectures

Triggered by looking at why Python doesn't find db.h (because it greps db.h for
a regex, and db.h is actually a oe_multilib_header wrapper) I realised that the
only reason we have to oe_multilib_header db.h is because one typedef is
different between 32-bit and 64-bit architectures.

However, the typedef is for a 64-bit integer so instead of using long (64-bit)
or long long (32-bit), just use int64_t.  Some of the overly complicated
configure tests need to be deleted after this change but that is safe as we're
building in a controlled environment and can assume int64_t exists.

With this done the header doesn't change between architectures, and it doesn't
need to be wrapped by oe_multilib_header.

Signed-off-by: Ross Burton <ross.burton@intel.com>

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