[$] A new version of modversions

The genksyms tool has long been buried deeply within the kernel'sbuild system; it is one of the two C-code parsers shipped with the kernel(the other being thehorrifying kernel-doc script). It is a key part of how thekernel's module-loading infrastructure works. While genksyms hasquietly done its job for decades, that period may soon be coming to an end.It would seem that genksyms is not up to the task of handling Rustcode, so Sami Tolvanen is proposinga new tool to handle this task going forward.