OpenSystemsDevelopment / qpdf

I don't use the travis build since I get more functionality on Azure
pipelines. I should remove it.

14.04 has been out of security support for a while.

Fix is based on guidance
https://support.microsoft.com/en-us/help/238187/cryptacquirecontext-use-and-troubleshooting
and is the proper fix for #285/#286

This commit adds the preserve_eol flags but doesn't implement EOL
preservation yet.

For wildcard expansion to work properly with the msvc binary, it is
necessary to link with setargv.obj or wsetargv.obj, depending on
whether wmain is in use.

This makes it more likely for someone who notices a big slow-down in
page splitting to discover the option.

Even though this is disallowed by the spec, files like this have been
encountered in the wild.

If QPDF_CRYPTO_PROVIDER is set, just run the tests for the given
provider. This is to support cases of running the entire test suite
for each provider. If QPDF_CRYPTO_PROVIDER is not set, run the tests
that exercise the cyrpto provider for each available provider.

I don't need qpdf's fuzz to find leaks and invalid memory in gnutls.

Thanks to Zdenek Dohnal <zdohnal@redhat.com> for contributing the code
used for the gnutls crypto provider.