Make improvements

- You can now run `make -j8 toolchain` on Windows
- You can now run `make -j` on MacOS ARM64 and BSD OSes
- You can now use our Emacs dev environment on MacOS/Windows
- Fix bug where the x16 register was being corrupted by --ftrace
- The programs under build/bootstrap/ are updated as fat binaries
- The Makefile now explains how to download cosmocc-0.0.12 toolchain
- The build scripts under bin/ now support "cosmo" branded toolchains
- stat() now goes faster on Windows (shaves 100ms off `make` latency)
- Code cleanup and added review on the Windows signal checking code
- posix_spawnattr_setrlimit() now works around MacOS ARM64 bugs
- Landlock Make now favors posix_spawn() on non-Linux/OpenBSD
- posix_spawn() now has better --strace logging on Windows
- fstatat() can now avoid EACCES in more cases on Windows
- fchmod() can now change the readonly bit on Windows

libc/intrin/createthread.c

@@ -19,10 +19,12 @@
 #include "libc/calls/syscall_support-nt.internal.h"
 #include "libc/intrin/describeflags.internal.h"
 #include "libc/intrin/strace.internal.h"
+#include "libc/nt/runtime.h"
 #include "libc/nt/struct/securityattributes.h"
 #include "libc/nt/thread.h"
 
 __msabi extern typeof(CreateThread) *const __imp_CreateThread;
+__msabi extern typeof(GetLastError) *const __imp_GetLastError;
 
 /**
  * Opens file on the New Technology.
@@ -41,9 +43,10 @@ CreateThread(const struct NtSecurityAttributes *lpThreadAttributes,
   int64_t hHandle;
   hHandle = __imp_CreateThread(lpThreadAttributes, dwStackSize, lpStartAddress,
                                lpParameter, dwCreationFlags, opt_lpThreadId);
-  NTTRACE("CreateThread(%s, %'zu, %t, %p, %s, %p) → %ld% m",
+  NTTRACE("CreateThread(%s, %'zu, %t, %p, %s, %p) → {%ld, %d}",
           DescribeNtSecurityAttributes(lpThreadAttributes), dwStackSize,
           lpStartAddress, lpParameter,
-          DescribeThreadCreateFlags(dwCreationFlags), opt_lpThreadId, hHandle);
+          DescribeThreadCreateFlags(dwCreationFlags), opt_lpThreadId, hHandle,
+          __imp_GetLastError());
   return hHandle;
 }