kvdb/sqlbase: use positive+negative build tags for new sql error parsing

In this commit, we use exhaustive build tags to ensure that we can
always build the `sqlbase` package, independent of the set build tags.
To do this, we move the type declarations _into_ the parsing functions.
This then allows us to create two versions for each db: with the db, and
without it.

To avoid a module tag round trip to get this working, we use a local
replace for now. Once this is merged in, we can do the tag (along side
rc3), then remove the replace.

go.sum

@@ -450,8 +450,6 @@ github.com/lightningnetwork/lnd/clock v1.1.0 h1:/yfVAwtPmdx45aQBoXQImeY7sOIEr7IX
 github.com/lightningnetwork/lnd/clock v1.1.0/go.mod h1:KnQudQ6w0IAMZi1SgvecLZQZ43ra2vpDNj7H/aasemg=
 github.com/lightningnetwork/lnd/healthcheck v1.2.2 h1:im+qcpgSuteqRCGeorT9yqVXuLrS6A7/acYzGgarMS4=
 github.com/lightningnetwork/lnd/healthcheck v1.2.2/go.mod h1:IWY0GChlarRbXFkFDdE4WY5POYJabe/7/H1iCZt4ZKs=
-github.com/lightningnetwork/lnd/kvdb v1.4.3 h1:IqtByi6fJfQXMZMdS8iY1+D5wpKcuH0Mfx2pjJ6oJ48=
-github.com/lightningnetwork/lnd/kvdb v1.4.3/go.mod h1:9SuaIqMA9ugrVkdvgQkYXa8CAKYNYd4vsEYORP4V698=
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 github.com/lightningnetwork/lnd/queue v1.1.0/go.mod h1:YTkTVZCxz8tAYreH27EO3s8572ODumWrNdYW2E/YKxg=
 github.com/lightningnetwork/lnd/ticker v1.0.0/go.mod h1:iaLXJiVgI1sPANIF2qYYUJXjoksPNvGNYowB8aRbpX0=