test failures and TestHelper update

["Ross McFarland" <rwmcfa1 neces com>]

just commited trivial changes to TestHelper so that it ignores noinit on
systems where gtk+'s version is < 2.2.0. those older versions require that
init to be called before doing pretty much anything.

on the same system i worked on this on i had the following failure and
warning. it's rh8, gtk+ version 2.0.6.

t/GtkDnd.....................ok 1/4Can't locate object method "new" via
package "Gtk2::Gdk::Event" at t/GtkDnd.t line 25.
t/GtkDnd.....................ok 2/4# Looks like you planned 4 tests but only
ran 2.
# Looks like your test died just after 2.
t/GtkDnd.....................dubious
        Test returned status 255 (wstat 65280, 0xff00)
DIED. FAILED tests 3-4
        Failed 2/4 tests, 50.00% okay
t/GtkDrawingArea.............ok


t/GtkViewport................ok 3/6Gtk-WARNING **: unable to find signal
handler for object(GtkAdjustment:0x82a1bb0) with func((nil)) and
data(0x82a00d0) at t/GtkViewport.t line 17.
t/GtkViewport................ok 6/6Gtk-WARNING **: unable to find signal
handler for object(GtkAdjustment:0x82a1bb0) with func((nil)) and
data(0x82a2320).
t/GtkViewport................ok

later,
-rm