FindDefinedSymbol() is subtly broken

Long story short: It expects an array of paths, but will die if it
can't find the symbol in the first path. Arguably it's a bug, but
since the original use case for multiple paths is long gone anyway, it
might never occur in practice. The attached patch changes it to expect
a single path.

Also attached: a few minor build script cleanups I've noticed along the way:
-more accurate error message
-s/print sprintf/printf/
-a recent perltidy change made a couple multi-line strings look odd,
so use heredocs (which other scripts use in this case anyway)
-make generated file footers match project style
-remove a duplicate comment

-John Naylor