Add support for sqliteembedded sql database

Packages describing “sqlite” as local USE flag

Package “sqlite” Flag Description
net-im/ekg2 Support logging messages into SQLite3 database.
net-irc/inspircd Enable Sqlite database backend
sys-apps/duc Use dev-db/sqlite:3 as the backend
app-portage/eix Compile in support for portage's sqlite backend; to actually use it you need additional configuration of portage and eix
games-action/supertuxkart Record IP bans, statistics in server mode with dev-db/sqlite
net-analyzer/linkchecker Mozilla Bookmark parsing
net-im/ejabberd Enable SQLite database support
sci-geosciences/viking Enable MBTiles support based on dev-db/sqlite

All packages providing a “sqlite” USE flag (101)