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/testlib/testmain.c

@@ -86,7 +86,7 @@ int main(int argc, char *argv[]) {
   testlib_runalltests();
   if (!g_testlib_failed && runbenchmarks_ && weaken(testlib_runallbenchmarks)) {
     weaken(testlib_runallbenchmarks)();
-    if (!g_testlib_failed) {
+    if (!g_testlib_failed && IsRunningUnderMake()) {
       return 254; /* compile.com considers this 0 and propagates output */
     }
   }