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

test/libc/stdio/vappendf_test.c

@@ -157,6 +157,16 @@ TEST(appendd, testMemFail_doesntFreeExistingAllocation) {
   free(b);
 }
 
+TEST(appendd, nontrivialAmountOfMemory) {
+  char *b = 0;
+  int i, n = 40000;
+  for (i = 0; i < n; ++i) {
+    ASSERT_EQ(2, appendd(&b, "hi", 2));
+  }
+  EXPECT_EQ(40000 * 2, appendz(b).i);
+  free(b);
+}
+
 BENCH(vappendf, bench) {
   const char t[] = {0};
   char *b = 0;