#30 ant.is.15+ check fails for 1.6.2

[Jon Rafkind]

In build.xml line 119 is a check to see if ant is
sufficiently new but currently only checks for versions
of 1.5.X. The following code allows the check to pass
for 1.6.X but maybe it should be generalized to work
for any version greater than 1.5.X:

<condition property="ant.is.15+" >
<or>
<contains string="${ant.version}"
substring="1.5" />
<contains string="${ant.version}"
substring="1.6" />
</or>
</condition>

[Vlad Roubtsov]

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user_id=1013207

The ANT version check was removed completely (in HEAD) back
in 2004.This is low priority, so I am not going to replicate
it in the v2.0 branch.