Improve locks and signals

- Introduce fast spinlock API
- Double rand64() perf w/ spinlock
- Improve raise() on New Technology
- Support gettid() across platforms
- Implement SA_NODEFER on New Technology
- Move the lock intrinsics into LIBC_INTRIN
- Make SIGTRAP recoverable on New Technology
- Block SIGCHLD in wait4() on New Technology
- Add threading prototypes for XNU and FreeBSD
- Rewrite abort() fixing its minor bugs on XNU/NT
- Shave down a lot of the content in libc/bits/bits.h
- Let signal handlers modify CPU registers on New Technology

tool/plinko/lib/printf.c

@@ -20,11 +20,11 @@
 #include "libc/nexgen32e/rdtsc.h"
 #include "libc/runtime/runtime.h"
 #include "libc/str/str.h"
+#include "libc/time/clockstonanos.internal.h"
 #include "tool/plinko/lib/char.h"
 #include "tool/plinko/lib/plinko.h"
 #include "tool/plinko/lib/print.h"
 #include "tool/plinko/lib/printf.h"
-#include "tool/plinko/lib/time.h"
 
 static inline long GetVarInt(va_list va, signed char t) {
   if (t <= 0) return va_arg(va, int);