Make more fixes and improvements

- Fix Makefile flaking due to ZIPOBJ_FLAGS generation
- Make printf() floating point and gdtoa thread safe
- Polish up the runit / runitd programs some more
- Prune some more makefile dependencies

libc/intrin/describefutexop.c

@@ -0,0 +1,37 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2022 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/intrin/describeflags.internal.h"
+#include "libc/macros.internal.h"
+#include "libc/nt/enum/consolemodeflags.h"
+#include "libc/sysv/consts/futex.h"
+
+const char *DescribeNtFutexOp(int x) {
+  const struct DescribeFlags kFutexOp[] = {
+      {FUTEX_WAIT_PRIVATE, "WAIT_PRIVATE"},        //
+      {FUTEX_WAKE_PRIVATE, "WAKE_PRIVATE"},        //
+      {FUTEX_REQUEUE_PRIVATE, "REQUEUE_PRIVATE"},  //
+      {FUTEX_PRIVATE_FLAG, "PRIVATE_FLAG"},        //
+      {FUTEX_REQUEUE, "REQUEUE"},                  //
+      {FUTEX_WAIT, "WAIT"},                        //
+      {FUTEX_WAKE, "WAKE"},                        //
+  };
+  _Alignas(char) static char futexop[32];
+  return DescribeFlags(futexop, sizeof(futexop), kFutexOp, ARRAYLEN(kFutexOp),
+                       "FUTEX_", x);
+}