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/terminateprocess.c

@@ -23,6 +23,7 @@
 #include "libc/nt/thunk/msabi.h"
 
 __msabi extern typeof(TerminateProcess) *const __imp_TerminateProcess;
+__msabi extern typeof(GetLastError) *const __imp_GetLastError;
 
 /**
  * Terminates the specified process and all of its threads.
@@ -30,6 +31,7 @@ __msabi extern typeof(TerminateProcess) *const __imp_TerminateProcess;
 textwindows bool32 TerminateProcess(int64_t hProcess, uint32_t uWaitStatus) {
   bool32 ok;
   ok = __imp_TerminateProcess(hProcess, uWaitStatus);
-  NTTRACE("TerminateProcess(%ld, %u) → %hhhd% m", hProcess, uWaitStatus, ok);
+  NTTRACE("TerminateProcess(%ld, %u) → {%hhhd, %d}", hProcess, uWaitStatus, ok,
+          __imp_GetLastError());
   return ok;
 }