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/nt/kernel32/TlsGetValue.s

@@ -1,2 +1,15 @@
 .include "o/libc/nt/codegen.inc"
 .imp	kernel32,__imp_TlsGetValue,TlsGetValue,0
+
+	.text.windows
+__TlsGetValue:
+	push	%rbp
+	mov	%rsp,%rbp
+	.profilable
+	mov	%rdi,%rcx
+	sub	$32,%rsp
+	call	*__imp_TlsGetValue(%rip)
+	leave
+	ret
+	.endfn	__TlsGetValue,globl
+	.previous