update roundcube to 0.9.3
Merge branch 'develop' of https://github.com/filin20/spksrc into develop

Conflicts:
	cross/roundcube/Makefile
	cross/roundcube/digests
	spk/roundcube/Makefile
update to 0.9.3 after rebase
Merge pull request #639 from filin20/develop

Update roundcube to 0.9.3