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/str/utf16.h

@@ -5,6 +5,9 @@
 #define UTF16_MOAR 0xd800 /* 0xD800..0xDBFF */
 #define UTF16_CONT 0xdc00 /* 0xDC00..0xDBFF */
 
+#if !(__ASSEMBLER__ + __LINKER__ + 0)
+COSMOPOLITAN_C_START_
+
 #define IsUcs2(wc)         (((wc)&UTF16_MASK) != UTF16_MOAR)
 #define IsUtf16Cont(wc)    (((wc)&UTF16_MASK) == UTF16_CONT)
 #define MergeUtf16(lo, hi) ((((lo)-0xD800) << 10) + ((hi)-0xDC00) + 0x10000)
@@ -17,4 +20,8 @@
                 ((((wc)-0x10000) & 1023) + 0xDC00) << 16) \
              : 0xFFFD)
 
+wint_t DecodeNtsUtf16(const char16_t **);
+
+COSMOPOLITAN_C_END_
+#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
 #endif /* COSMOPOLITAN_LIBC_STR_UTF16_H_ */