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/trampoline.h

@@ -0,0 +1,20 @@
+#ifndef COSMOPOLITAN_LIBC_NEXGEN32E_TRAMPOLINE_H_
+#define COSMOPOLITAN_LIBC_NEXGEN32E_TRAMPOLINE_H_
+#if !(__ASSEMBLER__ + __LINKER__ + 0)
+
+#define TRAMPOLINE(FUNCTION, THUNK)       \
+  ({                                      \
+    typeof(FUNCTION) *Tramp;              \
+    asm(".pushsection .text.trampoline\n" \
+        "183:\n\t"                        \
+        "mov\t%1,%%eax\n\t"               \
+        "jmp\t" #THUNK "\n\t"             \
+        ".popsection\n\t"                 \
+        "mov\t$183b,%k0"                  \
+        : "=r"(Tramp)                     \
+        : "i"(FUNCTION));                 \
+    Tramp;                                \
+  })
+
+#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
+#endif /* COSMOPOLITAN_LIBC_NEXGEN32E_TRAMPOLINE_H_ */