Make fixes, improvements, and chibicc python bindings

- python now mixes audio 10x faster
- python octal notation is restored
- chibicc now builds code 3x faster
- chibicc now has help documentation
- chibicc can now generate basic python bindings
- linenoise now supports some paredit-like features

See #141

libc/str/strpbrk.c

@@ -16,7 +16,6 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/nexgen32e/hascharacter.internal.h"
 #include "libc/str/str.h"
 
 /**
@@ -24,17 +23,21 @@
  * @asyncsignalsafe
  */
 char *strpbrk(const char *s, const char *accept) {
-  size_t i;
+  bool lut[256];
   if (accept[0]) {
     if (!accept[1]) {
       return strchr(s, accept[0]);
     } else {
-      for (i = 0; s[i]; ++i) {
-        if (HasCharacter(s[i], accept)) {
-          return (/*unconst*/ char *)&s[i];
+      memset(lut, 0, sizeof(lut));
+      while (*accept) {
+        lut[*accept++ & 255] = true;
+      }
+      for (; *s; ++s) {
+        if (lut[*s & 255]) {
+          return (/*unconst*/ char *)s;
         }
       }
     }
   }
-  return NULL;
+  return 0;
 }