First draft of arpack-ng

In the `test do` block, I have the following code:

    system "/usr/local/bin/dnsimp --version"
    system "/usr/local/bin/bug_1323 --version"

Those lines will fail. Why?

Because in the original source distribution, these two binaries are used
for testing the compiled libraries:

    TESTS/dnsimp
    TESTS/bug_1323

and they require the file

    TESTS/testA.mtx

I don't think these binaries and test suites are needed in the Homebrew
install.  Is there a way to prevent them from being symlinked in
`/usr/local/bin`?

This is my first Homebrew formula and I do not know any Ruby, so please
bear with me.