Make exciting improvements

- Add Lua backtraces to redbean!
- Wipe serving keys after redbean forks
- Audit redbean to remove free via exit
- Log SSL client ciphersuite preferences
- Increase ASAN malloc() backtrace depth
- Make GetSslRoots() behave as a singleton
- Move leaks.c from LIBC_TESTLIB to LIBC_LOG
- Add undocumented %n to printf() for newlines
- Fix redbean memory leak reindexing inode change
- Fix redbean memory leak with Fetch() DNS object
- Restore original environ after __cxa_finalize()
- Make backtrace always work after __cxa_finalize()
- Introduce COUNTEXPR() diagnostic / benchmark tool
- Fix a few more instances of errno being clobbered
- Consolidate the ANSI color disabling internal APIs

libc/fmt/fmt.c

@@ -40,6 +40,8 @@
     }                             \
   } while (0)
 
+extern bool __nomultics;
+
 static const char kSpecialFloats[2][2][4] = {{"INF", "inf"}, {"NAN", "nan"}};
 
 static void __fmt_free_dtoa(char **mem) {
@@ -385,6 +387,11 @@ hidden int __fmt(void *fn, void *arg, const char *format, va_list va) {
         }
         break;
 
+      case 'n':
+        if (__nomultics) PUT('\r');
+        PUT('\n');
+        break;
+
       case 'F':
       case 'f':
         if (!(flags & FLAGS_PRECISION)) prec = 6;