Fix bugs and make improvements

- Get clone() working on FreeBSD
- Increase some Python build quotas
- Add more atomic builtins to chibicc
- Fix ASAN poisoning of alloca() memory
- Make MODE= mandatory link path tinier
- Improve the examples folder a little bit
- Start working on some more resource limits
- Make the linenoise auto-complete UI as good as GNU readline
- Update compile.com, avoiding AVX codegen on non-AVX systems
- Make sure empty path to syscalls like opendir raises ENOENT
- Correctly polyfill ENOENT vs. ENOTDIR on the New Technology
- Port bestline's paredit features to //third_party/linenoise
- Remove workarounds for RHEL 5.0 bugs that were fixed in 5.1

libc/calls/renameat-nt.c

@@ -19,12 +19,9 @@
 #include "libc/calls/internal.h"
 #include "libc/nt/enum/movefileexflags.h"
 #include "libc/nt/files.h"
-#include "libc/nt/runtime.h"
-#include "libc/str/str.h"
-#include "libc/sysv/errfuns.h"
 
 textwindows int sys_renameat_nt(int olddirfd, const char *oldpath, int newdirfd,
-                            const char *newpath) {
+                                const char *newpath) {
   char16_t oldpath16[PATH_MAX];
   char16_t newpath16[PATH_MAX];
   if (__mkntpathat(olddirfd, oldpath, 0, oldpath16) == -1 ||
@@ -34,6 +31,6 @@ textwindows int sys_renameat_nt(int olddirfd, const char *oldpath, int newdirfd,
   if (MoveFileEx(oldpath16, newpath16, kNtMovefileReplaceExisting)) {
     return 0;
   } else {
-    return __winerr();
+    return __fix_enotdir3(-1, oldpath16, newpath16);
   }
 }