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/strcmp.c

@@ -34,9 +34,11 @@ static inline noasan uint64_t UncheckedAlignedRead64(const char *p) {
  * @asyncsignalsafe
  */
 int strcmp(const char *a, const char *b) {
+  int c;
   size_t i = 0;
   uint64_t v, w, d;
   if (a == b) return 0;
+  if ((c = (*a & 255) - (*b & 255))) return c;
   if (((uintptr_t)a & 7) == ((uintptr_t)b & 7)) {
     for (; (uintptr_t)(a + i) & 7; ++i) {
       if (a[i] != b[i] || !b[i]) {