[$] Glibc wrappers for (nearly all) Linux system calls

The GNU C Library (glibc) is a famously conservative project. In the past,that conservatism created a situation where there is no way to directlycall a number of Linux system calls from a glibc-using program. As glibchas relaxed a bit in recent years, its developers have started toreconsider adding wrapper functions for previously inaccessible systemcalls. But, as the discussion shows, adding these wrappers is still not asstraightforward as one might think.