Fix warnings

This change fixes Cosmopolitan so it has fewer opinions about compiler
warnings. The whole repository had to be cleaned up to be buildable in
-Werror -Wall mode. This lets us benefit from things like strict const
checking. Some actual bugs might have been caught too.

third_party/python/Python/cosmomodule.c

@@ -100,13 +100,13 @@ cosmo_rdtsc(PyObject *self, PyObject *noargs)
     return PyLong_FromUnsignedLong(rdtsc());
 }
 
+#ifdef __x86_64__
+
 PyDoc_STRVAR(getcpucore_doc,
 "getcpucore($module)\n\
 --\n\n\
 Returns 0-indexed CPU core on which process is currently scheduled.");
 
-#ifdef __x86_64__
-
 static PyObject *
 cosmo_getcpucore(PyObject *self, PyObject *noargs)
 {
@@ -137,7 +137,6 @@ Similar to zlib.crc32().");
 static PyObject *
 cosmo_crc32c(PyObject *self, PyObject *args)
 {
-    Py_ssize_t n;
     Py_buffer data;
     unsigned crc, init = 0;
     if (!PyArg_ParseTuple(args, "y*|I:crc32c", &data, &init)) return 0;
@@ -283,8 +282,6 @@ cosmo_exit1(PyObject *self, PyObject *args)
     _Exit(1);
 }
 
-static bool ftrace_installed = 0;
-
 typedef struct {
     PyObject_HEAD
 } FtracerObject;
@@ -327,6 +324,7 @@ static PyTypeObject FtracerType = {
     .tp_methods = FtracerObject_methods,
 };
 
+#ifdef FTRACE
 PyDoc_STRVAR(ftrace_doc,
 "ftrace($module)\n\
 --\n\n\
@@ -337,6 +335,7 @@ Enables logging of C function calls to stderr, e.g.\n\
 \n\
 Please be warned this prints massive amount of text. In order for it\n\
 to work, the concomitant .com.dbg binary needs to be present.");
+#endif
 
 static PyObject *
 cosmo_ftrace(PyObject *self, PyObject *noargs)