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

third_party/lua/lapi.c

@@ -726,6 +726,7 @@ LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
  */
 LUA_API void lua_pushboolean (lua_State *L, int b) {
   lua_lock(L);
+  /* a.k.a. L->top->val.tt_ = b ? LUA_VTRUE : LUA_VFALSE; */
   if (b)
     setbtvalue(s2v(L->top));
   else