Move current_timespec decl to timespec.h
This change was motivated by the desire to remove the weird dependency of lib-src/profile.o on src/systime.h. profile.c included systime.h only for current_timespec, and this inclusion required systime.h to have #ifdef emacs in multiple places and complicated further changes I have in mind. The current_timespec decl belongs in timespec.h anyway, and the main effect of this change is to move it there. * lib-src/profile.c (INLINE): Remove. Include timespec.h, not systime.h. * lib/gettime.c (gettime): Prefer clock_gettime to nanotime, and don’t worry about it failing on a CLOCK_REALTIME arg. POSIX requires it to succeed and I don’t know of any counterexamples where the fallbacks would work. (current_timespec): Move here from src/systime.h. Nowadays it seems to be better to not have this function be inline. * lib/timespec.h: Include arg-nonnull.h. (current_timespec): New declaration. (gettime, settime): Declare args to be nonnull. * lib/gettime.c, lib/timespec.h: Copy from Gnulib. * src/systime.h: Simplify by assuming ‘emacs’ is defined, which it always is now. (current_timespec): Move to lib/timespec.h.
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