Long ago in 334702ee05 generic types
were added. However in at least one place a previous assumption
that existed was broken. That assumption was the true
type of ResourceInfo.getTools() would be Tool[] as opposed to ITool[].
That commit broke it for ResourceConfiguration.getTools()
Internally in CDT ITool is in practice always Tool, and as a result
there are lots of downcast from ITool -> Tool. However ITool[] cannot
be downcast to Tool[] unless the original type was Tool[].
Instead we use Arrays.copyOf to copy the array into the correct
array type.
Steps to reproduce the problem now fixed:
1. Create a Managed Build executable project.
2. Open the properties window of the source file (as opposed to project)
3. At the Properties page, navigate to "C/C++ Build/Tool Chain Editor".
4. Click the "Apply" button.
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