See
8e0e093650
for when they fixed it. This commit simply edits `setImGuiPath()` to
nothing so we are able to properly override `imgui.library.name` for
older, broken Veil versions.
Hash the jar (which is now reproducable) and use that for version file
Also made it so it is no longer dependent on `pwd` being the root
project.
Should fix part of the issues this has on compiling in android (termux /
Android Code Studio)
