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

third_party/m4/eval.c

@@ -40,7 +40,7 @@
  * by: oz
  */
 
-#include "libc/bits/safemacros.h"
+#include "libc/bits/safemacros.internal.h"
 #include "libc/conv/conv.h"
 #include "libc/errno.h"
 #include "libc/limits.h"

third_party/m4/main.c

@@ -44,7 +44,7 @@ asm(".include \"third_party/m4/COPYING\"");
 
 #include "libc/assert.h"
 #include "libc/log/bsd.h"
-#include "libc/calls/openbsd.h"
+#include "libc/calls/openbsd.internal.h"
 #include "libc/calls/calls.h"
 #include "libc/sysv/consts/sig.h"
 #include "third_party/getopt/getopt.h"