Make improvements

- Introduce path module to redbean
- Fix glitch with linenoise printing extra line on eof
- Introduce closefrom() and close_range() system calls
- Make file descriptor closing more secure in pledge.com

examples/tls.c

@@ -0,0 +1,23 @@
+#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
+
+/**
+ * @fileoverview thread local storage
+ *
+ * Cosmopolitan guarantees `_Thread_local` variables are always
+ * accessible, even if you're not using threads.
+ */
+
+_Thread_local int x;
+_Thread_local int y = 42;
+
+int main(int argc, char *argv[]) {
+  return x + y;
+}