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/reopenfile.c

@@ -20,9 +20,11 @@
 #include "libc/intrin/describeflags.internal.h"
 #include "libc/intrin/strace.internal.h"
 #include "libc/nt/files.h"
+#include "libc/nt/runtime.h"
 #include "libc/nt/thunk/msabi.h"
 
 __msabi extern typeof(ReOpenFile) *const __imp_ReOpenFile;
+__msabi extern typeof(GetLastError) *const __imp_GetLastError;
 
 /**
  * Reopens file on the New Technology.
@@ -34,9 +36,10 @@ int64_t ReOpenFile(int64_t hOriginalFile, uint32_t dwDesiredAccess,
   int64_t hHandle;
   hHandle = __imp_ReOpenFile(hOriginalFile, dwDesiredAccess, dwShareMode,
                              dwFlagsAndAttributes);
-  NTTRACE("ReOpenFile(%ld, %s, %s, %s) → %ld% m", hOriginalFile,
+  NTTRACE("ReOpenFile(%ld, %s, %s, %s) → {%ld, %d}", hOriginalFile,
           DescribeNtFileAccessFlags(dwDesiredAccess),
           DescribeNtFileShareFlags(dwShareMode),
-          DescribeNtFileFlagAttr(dwFlagsAndAttributes), hHandle);
+          DescribeNtFileFlagAttr(dwFlagsAndAttributes), hHandle,
+          __imp_GetLastError());
   return hHandle;
 }