Update bdb.mk

[dskjkljdas]

Thanks to ZCASH team, fixes case issue cross compiling

https://github.com/zcash/zcash/commit/3d308c2232df9201d15e352df7c824be4950d63b

Pull requests without a rationale and clear improvement may be closed immediately.

Please provide clear motivation for your patch and explain how it improves Bitcoin Core user experience or Bitcoin Core developer experience significantly.

• Any test improvements or new tests that improve coverage are always welcome.
• All other changes should have accompanying unit tests (see src/test/) or functional tests (see test/). Contributors should note which tests cover modified code. If no tests exist for a region of modified code, new tests should accompany the change.
• Bug fixes are most welcome when they come with steps to reproduce or an explanation of the potential issue as well as reasoning for the way the bug was fixed.
• Features are welcome, but might be rejected due to design or scope issues. If a feature is based on a lot of dependencies, contributors should first consider building the system outside of Bitcoin Core, if possible.
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Bitcoin Core has a thorough review process and even the most trivial change needs to pass a lot of eyes and requires non-zero or even substantial time effort to review. There is a huge lack of active reviewers on the project, so patches often sit for a long time.

[TeamCyberCrypto]

2x chk line. ZCASH team, we thank you.