Add support for sqlite - embedded sql database

Packages describing “sqlite” as local USE flag

Package“sqlite” Flag Description
app-portage/eixCompile in support for portage's sqlite backend; to actually use it you need additional configuration of portage and eix
games-action/supertuxkartRecord IP bans, statistics in server mode with dev-db/sqlite
net-analyzer/linkcheckerMozilla Bookmark parsing
net-im/ejabberdEnable SQLite database support
net-irc/inspircdEnable Sqlite database backend
net-p2p/bitcoin-coreSupport descriptor wallets in SQLite format
sys-apps/ducUse dev-db/sqlite:3 as the backend

All packages providing a “sqlite” USE flag (87)