[pybsddb] AArch64 debian issue with python berkeleydb bindings

[Markuss Broks]

Hello,

On Debian AArch64, the Berkeleydb lib is installed into 
/usr/lib/aarch64-linux-gnu, and setup3.py only looks in /usr/lib{64} and 
in /usr/lib/x86_64-linux-gnu.

Thus it cannot find an installation of berkeleydb and fails. I couldn't 
find information on how to send patches, and I'm not sure what's the 
best way to fix it (e.g. for riscv64 and arm32 too), so I'm reporting it 
this way instead of just sending a patch.

Setting BERKELEYDB_INCDIR=/usr/include/ 
BERKELEYDB_LIBDIR=/usr/lib/aarch64-linux-gnu/ works around the issue.

Thanks,

- Markuss