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

libc/nexgen32e/djbsort.c

@@ -26,10 +26,10 @@ void djbsort$avx2(int32_t *, long);
 /**
  * D.J. Bernstein's outrageously fast integer sorting algorithm.
  */
-void djbsort(size_t n, int32_t a[n]) {
+void djbsort(int32_t *a, size_t n) {
   if (X86_HAVE(AVX2)) {
     djbsort$avx2(a, n);
   } else {
-    insertionsort(n, a);
+    insertionsort(a, n);
   }
 }