test: Fix server tests

[colinkiama]

Required for: valum-framework/valum#226

[colinkiama]

All test pass now without any modifications made to the test executables.

Here's more info about the default -rpath behaviour changes: https://stackoverflow.com/questions/52018092/how-to-set-rpath-and-runpath-with-gcc-ld

[arteymix]

So yeah, apparently -rpath now means -runpath. It's not transitive anymore, that's why the test binary is broken. Not that it is recommended though to use -rpath because it cannot be overwritten by the end-user.

We can address this differently though via pkg-config (maybe Lib.private? I need to review this) and redefining vsgi_dep to add the servers' folder to the dynamic linker. I'll merge this however since it address the regression.

Also your text editor is removing the last newline character of the file. We should copy over Valum's EditorConfig setup in this repository.

[arteymix]

Also, you can create branches in this repo for PRs since you have the privileges for that. It's a bit more convenient for me if I want to checkout your code.