Fix sigsuspend() and sigprocmask() on OpenBSD

Test reliability is now iron clad.

examples/seq.c

@@ -0,0 +1,34 @@
+#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/fmt/conv.h"
+#include "libc/stdio/stdio.h"
+
+/**
+ * @fileoverview Prints sequence of numbers.
+ */
+
+int main(int argc, char *argv[]) {
+  long a, b, i;
+  switch (argc) {
+    case 2:
+      a = 1;
+      b = strtol(argv[1], NULL, 0);
+      break;
+    case 3:
+      a = strtol(argv[1], NULL, 0);
+      b = strtol(argv[2], NULL, 0);
+      break;
+    default:
+      return 1;
+  }
+  for (i = a; i <= b; ++i) {
+    printf("%ld\n", i);
+  }
+}