Get codebase completely working with LLVM

You can now build Cosmopolitan with Clang:

    make -j8 MODE=llvm
    o/llvm/examples/hello.com

The assembler and linker code is now friendly to LLVM too.
So it's not needed to configure Clang to use binutils under
the hood. If you love LLVM then you can now use pure LLVM.

libc/dns/dnsheader.h

@@ -13,10 +13,8 @@ struct DnsHeader {
   uint16_t arcount; /* additional record count */
 };
 
-int serializednsheader(uint8_t *buf, size_t size,
-                       const struct DnsHeader header);
-int deserializednsheader(struct DnsHeader *header, const uint8_t *buf,
-                         size_t size);
+int serializednsheader(uint8_t *, size_t, const struct DnsHeader);
+int deserializednsheader(struct DnsHeader *, const uint8_t *, size_t);
 
 COSMOPOLITAN_C_END_
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */