Rename CMake find_package helpers to avoid developer warnings

| CMake Warning (dev) at /usr/share/cmake-3.18/Modules/FindPackageHandleStandardArgs.cmake:273 (message):
|   The package name passed to `find_package_handle_standard_args` (Berkeley)
|   does not match the name of the calling package (BerkeleyDB).  This can lead
|   to problems in calling code that expects `find_package` result variables
|   (e.g., `_FOUND`) to follow a certain pattern.
| Call Stack (most recent call first):
|   CMake/FindBerkeleyDB.cmake:57 (find_package_handle_standard_args)
|   CMakeLists.txt:83 (find_package)
| This warning is for project developers.  Use -Wno-dev to suppress it.

And indeed, we checked for BERKLEY_DB_FOUND which was not defined so our
HAVE_BDB was not set – just that it is never used, so it wasn't noticed.

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