Fix bugs and make improvements

- Fix regression with `%lu`
- Added some more headers witnessed in the wild
- Added `-M INT` option to redbean to tune max payload size
- Work around InfoZIP 256 character limit on comment line size

examples/hertz.c

@@ -0,0 +1,43 @@
+#if 0
+/*─────────────────────────────────────────────────────────────────╗
+│ To the extent possible under law, Justine Tunney has waived      │
+│ all copyright and related or neighboring rights to this file,    │
+│ as it is written in the following disclaimers:                   │
+│   • http://unlicense.org/                                        │
+│   • http://creativecommons.org/publicdomain/zero/1.0/            │
+╚─────────────────────────────────────────────────────────────────*/
+#endif
+#include "libc/calls/calls.h"
+#include "libc/calls/struct/itimerval.h"
+#include "libc/errno.h"
+#include "libc/log/check.h"
+#include "libc/stdio/stdio.h"
+#include "libc/sysv/consts/itimer.h"
+#include "libc/sysv/consts/sig.h"
+#include "libc/time/time.h"
+#include "libc/x/x.h"
+
+const struct itimerval kHertz = {
+    {1, 0},
+    {0, 1},
+};
+
+bool hertz;
+
+void OnAlrm(void) {
+  hertz = true;
+}
+
+int main(int argc, char *argv[]) {
+  CHECK_NE(-1, xsigaction(SIGALRM, OnAlrm, 0, 0, 0));
+  CHECK_NE(-1, setitimer(ITIMER_REAL, &kHertz, NULL));
+  for (;;) {
+    CHECK_EQ(-1, pause());
+    CHECK_EQ(EINTR, errno);
+    if (hertz) {
+      hertz = false;
+      printf("ding\n");
+    }
+  }
+  return 0;
+}