run_dia.sh shell script now works again

[James Henstridge]

When adding all the flowchart shapes I did in XML to dia, I
unintentionally made it so that you needed to install dia before running
it.  I modified it a bit so you can set an environment variable to locate
the `internal shapes' (ones that make up part of a sheet with objects
written in C).  I have updated the run_dia.sh script so that it sets this,
and now things should work again.

James.

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