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/directmap.c

@@ -22,6 +22,7 @@
 #include "libc/intrin/describeflags.internal.h"
 #include "libc/nt/runtime.h"
 #include "libc/runtime/directmap.internal.h"
+#include "libc/runtime/memtrack.internal.h"
 #include "libc/str/str.h"
 
 /**