fix dev-haskell/gtk slot depends

'gtk:=' depend implicitly means 'gtk:0='.

We either need 'gtk:2=', 'gtk:3=', or '|| ( 'gtk:3=' 'gtk:2=')'

Fixed users to use 'gtk:2='.

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
dev-haskell/hsql-mysql: fix manifest

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>