wallet: bdb: move BerkeleyDatabase constructor to cpp file

Else some compilers/stdlibs may not be able to construct
std::unique_ptr<Db> without Db defined.

Author: theuni

src/wallet/bdb.cpp

@@ -296,6 +296,13 @@ static Span<const std::byte> SpanFromDbt(const SafeDbt& dbt)
     return {reinterpret_cast<const std::byte*>(dbt.get_data()), dbt.get_size()};
 }
 
+BerkeleyDatabase::BerkeleyDatabase(std::shared_ptr<BerkeleyEnvironment> env, fs::path filename, const DatabaseOptions& options) :
+    WalletDatabase(), env(std::move(env)), m_filename(std::move(filename)), m_max_log_mb(options.max_log_mb)
+{
+    auto inserted = this->env->m_databases.emplace(m_filename, std::ref(*this));
+    assert(inserted.second);
+}
+
 bool BerkeleyDatabase::Verify(bilingual_str& errorStr)
 {
     fs::path walletDir = env->Directory();

src/wallet/bdb.h

@@ -84,12 +84,7 @@ class BerkeleyDatabase : public WalletDatabase
     BerkeleyDatabase() = delete;
 
     /** Create DB handle to real database */
-    BerkeleyDatabase(std::shared_ptr<BerkeleyEnvironment> env, fs::path filename, const DatabaseOptions& options) :
-        WalletDatabase(), env(std::move(env)), m_filename(std::move(filename)), m_max_log_mb(options.max_log_mb)
-    {
-        auto inserted = this->env->m_databases.emplace(m_filename, std::ref(*this));
-        assert(inserted.second);
-    }
+    BerkeleyDatabase(std::shared_ptr<BerkeleyEnvironment> env, fs::path filename, const DatabaseOptions& options);
 
     ~BerkeleyDatabase() override;