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/rand/rdrand.c

@@ -26,7 +26,7 @@
 /**
  * Intel Secure Key Digital Random Number Generator
  * Introduced w/ Ivy Bridge c. 2013 and Excavator c. 2015
- * @see rand32(), rand64(), and randcpy()
+ * @see rdseed(), rand32(), rand64(), and randcpy()
  */
 uint64_t rdrand(void) {
   char cf;