Improve redbean

- Improve serialization
- Add Benchmark() API to redbean
- Refactor UNIX API to be assert() friendly
- Make the redbean Lua REPL print data structures
- Fix recent regressions in linenoise reverse search
- Add -i flag so redbean can be a language interpreter

libc/calls/geteuid.c

@@ -24,7 +24,7 @@
  * Returns effective user ID of calling process.
  * @return user id
  */
-uint32_t geteuid(void) {
+int geteuid(void) {
   int rc;
   if (!IsWindows()) {
     rc = sys_geteuid();