Import C++ Standard Template Library

You can now use the hardest fastest and most dangerous language there is
with Cosmopolitan. So far about 75% of LLVM libcxx has been added. A few
breaking changes needed to be made to help this go smoothly.

- Rename nothrow to dontthrow
- Rename nodiscard to dontdiscard
- Add some libm functions, e.g. lgamma, nan, etc.
- Change intmax_t from int128 to int64 like everything else
- Introduce %jjd formatting directive for int128_t
- Introduce strtoi128(), strtou128(), etc.
- Rename bsrmax() to bsr128()

Some of the templates that should be working currently are std::vector,
std::string, std::map, std::set, std::deque, etc.

tool/net/echoserver.c

@@ -86,7 +86,7 @@ struct Polls {
 struct Sockets g_sockets;
 struct Polls g_polls;
 
-nodiscard char *DescribeAddress(struct sockaddr_in *addr) {
+dontdiscard char *DescribeAddress(struct sockaddr_in *addr) {
   char ip4buf[16];
   return xasprintf("%s:%hu",
                    inet_ntop(addr->sin_family, &addr->sin_addr.s_addr, ip4buf,
@@ -94,7 +94,7 @@ nodiscard char *DescribeAddress(struct sockaddr_in *addr) {
                    ntohs(addr->sin_port));
 }
 
-nodiscard char *DescribeSocket(struct Socket *s) {
+dontdiscard char *DescribeSocket(struct Socket *s) {
   return xasprintf("%s:%s", s->protocol == IPPROTO_UDP ? "udp" : "tcp",
                    gc(DescribeAddress(&s->addr)));
 }

tool/net/lmaxmind.c

@@ -157,7 +157,7 @@ static MMDB_entry_data_list_s *LuaMaxmindDump(lua_State *L,
       lua_pushinteger(L, dl->entry_data.uint64);
       return dl->next;
     case MMDB_DATA_TYPE_UINT128:
-      sprintf(ibuf, "%#jx", dl->entry_data.uint128);
+      sprintf(ibuf, "%#jjx", dl->entry_data.uint128);
       lua_pushstring(L, ibuf);
       return dl->next;
     case MMDB_DATA_TYPE_DOUBLE:

tool/net/net.mk

@@ -153,7 +153,6 @@ o/$(MODE)/tool/net/redbean-demo.com.dbg:					\
 		o/$(MODE)/tool/net/lmaxmind.o					\
 		o/$(MODE)/tool/net/lsqlite3.o					\
 		o/$(MODE)/tool/net/largon2.o					\
-		o/$(MODE)/tool/net/lre.o					\
 		o/$(MODE)/tool/net/net.pkg					\
 		o/$(MODE)/tool/net/demo/sql.lua.zip.o				\
 		o/$(MODE)/tool/net/demo/fetch.lua.zip.o				\