Library Version 18.1.40

Global Message Prefix
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## Global Message Prefix

Berkeley DB applications can now configure a prefix to be used in informational, non-error messages and output informational messages that use it. This prefix is also used by the informational messages that are output by Berkeley DB library functions.

In addition, the signature of the message call function supplied to DB_ENV->set_msgcall() and DB->set_msgcall() has been changed to add a parameter containing the message prefix.

### New Functions

- `DB_ENV->set_msgpfx()`
- `DB_ENV->get_rrpfx()`
- `DB_ENV->msg()`
- `DB->set_msgpfx()`
- `DB->get_msgpfx()`
- `DB->msg()`

### Message Call Function Signature Change

- `DB_ENV->set_msgcall()`
- `DB->set_msgcall()`

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