[m-rev.] for review: implement --warn-stdlib-shadowing, part 2

[Zoltan Somogyi]

For review by anyone.

If anyone knows how to override VPATH for individual files,
please tell me; then we could enable the new test cases.
I already know that replacing "%.err" with "./%.err"
in the prerequisites of the .res_error rule does not work.

Zoltan.
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