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

libc/calls/onntconsoleevent.c

@@ -17,11 +17,14 @@
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/calls/sig.internal.h"
+#include "libc/calls/strace.internal.h"
+#include "libc/nexgen32e/nt2sysv.h"
 #include "libc/nt/enum/ctrlevent.h"
 #include "libc/sysv/consts/sicode.h"
 #include "libc/sysv/consts/sig.h"
 
 textwindows bool32 __onntconsoleevent(uint32_t dwCtrlType) {
+  STRACE("__onntconsoleevent(%u)", dwCtrlType);
   switch (dwCtrlType) {
     case kNtCtrlCEvent:
       __sig_add(SIGINT, SI_KERNEL);