Setting SQLite compile time parameters from etc.c.sqlite3

[data pulverizer]

Hello all,

I'm not sure how to set the compile time parameters in D's SQLite 
module particular the items that take multiple parameters, for 
example in the C API manual `SQLITE_CONFIG_MMAP_SIZE` takes two 
`sqlite3_int64`. How do I set these? Do I just write something 
like

```
enum SQLITE_CONFIG_MMAP_SIZE = [10_000_000_000, 30_000_000_000];
```
?

Writing this doesn't cause an error but I don't think it works 
because its supposed to speed up write times and I'm not 
observing any performance change.

Thanks in advance!