Handle postgresql and sqlite3 libs properly

Do not fail to compile when one of them is missing but the other one is not.

Raise an error when trying to open a database with the missing library.

see #3237

src/database/query.hpp

@@ -9,8 +9,6 @@
 #include <vector>
 #include <string>
 
-#include <sqlite3.h>
-
 void actual_bind(Statement& statement, const std::string& value, int index);
 void actual_bind(Statement& statement, const std::size_t value, int index);
 void actual_bind(Statement& statement, const OptionalBool& value, int index);