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Provide the getboottime(9) and getboottimebin(9) KPI. MFC r303387: Prevent parallel tc_windup() calls. Keep boottime in timehands, and adjust it from tc_windup(). MFC notes: The boottime and boottimebin globals are still exported from the kernel dyn symbol table in stable/11, but their declarations are removed from sys/time.h. This preserves KBI but not KPI, while all in-tree consumers are converted to getboottime(). The variables are updated after tc_setclock_mtx is dropped, which gives approximately same unlocked bugs as before. The boottime and boottimebin locals in several sys/kern_tc.c functions were renamed by adding the '_x' suffix to avoid name conficts.