Move tests for examples from tests/examples to tests/share/examples.

This is to match the layout of the installed and source files more closely.
While doing this, honor the MKSHARE variable, as the

Move tests for examples from tests/examples to tests/share/examples.

This is to match the layout of the installed and source files more closely.
While doing this, honor the MKSHARE variable, as the files these tests
validate are only installed when MKSHARE=yes.

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