Get binaries closer to running without an o/s

blinkenlights now does a pretty good job emulating what happens when
binaries boot from BIOS into long mode. So it's been much easier to
debug the bare metal process and wrinkle out many issues.

tool/build/lib/buffer.h

@@ -4,12 +4,12 @@
 COSMOPOLITAN_C_START_
 
 struct Buffer {
-  size_t i, n;
+  unsigned i, n;
   char *p;
 };
 
 void AppendChar(struct Buffer *, char);
-void AppendData(struct Buffer *, char *, size_t);
+void AppendData(struct Buffer *, char *, unsigned);
 void AppendStr(struct Buffer *, const char *);
 void AppendWide(struct Buffer *, wint_t);
 int AppendFmt(struct Buffer *, const char *, ...);