The <platform> element may contain a regular expression
matching the names of the platforms on which the plugin works.

Task-number: QTCREATORBUG-9002
Change-Id: Ic816cfed69a5dd2c4112c976843b9106ba2cbd22
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
Reviewed-by: hjk <hjk121@nokiamail.com>