Get Cosmopolitan into releasable state

A new rollup tool now exists for flattening out the headers in a way
that works better for our purposes than cpp. A lot of the API clutter
has been removed. APIs that aren't a sure thing in terms of general
recommendation are now marked internal.

There's now a smoke test for the amalgamation archive and gigantic
header file. So we can now guarantee you can use this project on the
easiest difficulty setting without the gigantic repository.

A website is being created, which is currently a work in progress:
https://justine.storage.googleapis.com/cosmopolitan/index.html

test/libc/calls/signal_test.c

@@ -24,11 +24,13 @@
 #include "libc/sysv/consts/sig.h"
 #include "libc/testlib/testlib.h"
 
-testonly void OnCtrlC(int sig) { _exit(0); }
+testonly void OnCtrlC(int sig) {
+  _exit(0);
+}
 
 TEST(signal, test) {
   if (IsWindows()) return; /* omg */
   ASSERT_NE(SIG_ERR, signal(SIGINT, OnCtrlC));
   ASSERT_NE(-1, raise(SIGINT));
-  die();
+  __die();
 }