Add support for sqliteembedded sql database

Packages describing “sqlite” as local USE flag

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

All packages providing a “sqlite” USE flag (103)