Make numerous improvements

- Python static hello world now 1.8mb
- Python static fully loaded now 10mb
- Python HTTPS client now uses MbedTLS
- Python REPL now completes import stmts
- Increase stack size for Python for now
- Begin synthesizing posixpath and ntpath
- Restore Python \N{UNICODE NAME} support
- Restore Python NFKD symbol normalization
- Add optimized code path for Intel SHA-NI
- Get more Python unit tests passing faster
- Get Python help() pagination working on NT
- Python hashlib now supports MbedTLS PBKDF2
- Make memcpy/memmove/memcmp/bcmp/etc. faster
- Add Mersenne Twister and Vigna to LIBC_RAND
- Provide privileged __printf() for error code
- Fix zipos opendir() so that it reports ENOTDIR
- Add basic chmod() implementation for Windows NT
- Add Cosmo's best functions to Python cosmo module
- Pin function trace indent depth to that of caller
- Show memory diagram on invalid access in MODE=dbg
- Differentiate stack overflow on crash in MODE=dbg
- Add stb_truetype and tools for analyzing font files
- Upgrade to UNICODE 13 and reduce its binary footprint
- COMPILE.COM now logs resource usage of build commands
- Start implementing basic poll() support on bare metal
- Set getauxval(AT_EXECFN) to GetModuleFileName() on NT
- Add descriptions to strerror() in non-TINY build modes
- Add COUNTBRANCH() macro to help with micro-optimizations
- Make error / backtrace / asan / memory code more unbreakable
- Add fast perfect C implementation of μ-Law and a-Law audio codecs
- Make strtol() functions consistent with other libc implementations
- Improve Linenoise implementation (see also github.com/jart/bestline)
- COMPILE.COM now suppresses stdout/stderr of successful build commands

libc/dns/resolvedns.c

@@ -61,7 +61,7 @@ int ResolveDns(const struct ResolvConf *resolvconf, int af, const char *name,
   if (addrsize < kMinSockaddr4Size) return einval();
   if (af != AF_INET && af != AF_UNSPEC) return eafnosupport();
   if (!resolvconf->nameservers.i) return 0;
-  memset(&h, 0, sizeof(h));
+  bzero(&h, sizeof(h));
   rc = ebadmsg();
   h.id = rand64();
   h.bf1 = 1; /* recursion desired */
@@ -69,7 +69,7 @@ int ResolveDns(const struct ResolvConf *resolvconf, int af, const char *name,
   q.qname = name;
   q.qtype = DNS_TYPE_A;
   q.qclass = DNS_CLASS_IN;
-  memset(msg, 0, sizeof(msg));
+  bzero(msg, sizeof(msg));
   SerializeDnsHeader(msg, &h);
   if ((n = SerializeDnsQuestion(msg + 12, 500, &q)) == -1) return -1;
   if ((fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1) return -1;