Fix bugs and make improvements

- Fix regression with `%lu`
- Added some more headers witnessed in the wild
- Added `-M INT` option to redbean to tune max payload size
- Work around InfoZIP 256 character limit on comment line size

libc/str/tpenc.h

@@ -11,7 +11,7 @@ uint64_t tpenc(int32_t) pureconst;
     long Edi, Buf;             \
     asm("call\ttpenc"          \
         : "=a"(Buf), "=D"(Edi) \
-        : "1"(CODE)            \
+        : "1"((int)(CODE))     \
         : "rcx", "rdx", "cc"); \
     Buf;                       \
   })