[oe] OBSOLETE in base.bbclass

[Frans Meulenbroeks]

Bumped upon this while peeking in base.bbclass:

    # OBSOLETE in bitbake 1.7.4
    srcdate = bb.data.getVar('SRCDATE_%s' % pn, d, 1)
    if srcdate != None:
        bb.data.setVar('SRCDATE', srcdate, d)

    use_nls = bb.data.getVar('USE_NLS_%s' % pn, d, 1)
    if use_nls != None:
        bb.data.setVar('USE_NLS', use_nls, d)

    setup_checksum_deps(d)

Not sure what part exactly is OBSOLETE, but I don't think we support
1.7.4 any more, so I feel it is better to clean this and remove the
obsolete section.

Any bitbake wiz care to comment on this?

Frans