linux: ensure dynamic library loads report clear error messages

[emidoots]

throughout the codebase we use std.DynLib to dynamically load libraries such as Vulkan, Wayland, X11, etc.

The goal of this issue is to ensure that when such libraries are not available and an error would be reported to the user, that it is a clear and well-explained error rather than something obscure like FileNotFound bubbling up the stack.

https://sourcegraph.com/search?q=repo:%5Egithub%5C.com/hexops/mach%24+std.DynLib.open&patternType=keyword&sm=0

[Keerpich]

I think PR #1328 fixed this, right?