Bug#930524: Rainloop suggests packages not in buster

[Evilham]

Package: rainloop
Version: 1.12.1-2

As the subject mentions, the rainloop package is suggesting 
packages that are not available on buster.

Specifically:

- php5-sqlite
- php5-mysql
- php5-pgsql

Since the rainloop documentation only says "PHP >= 5", maybe 
suggesting the versionless (php-*) packages instead is in order?

Thank you for starting this package,
--
Evilham