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

tool/build/mkdeps.c

@@ -178,7 +178,7 @@ unsigned GetSourceId(const char *name, size_t len) {
     do {
       i = (hash + step * (step + 1) / 2) & (sources.n - 1);
       if (sources.p[i].hash == hash &&
-          memcmp(name, &strings.p[sources.p[i].name], len) == 0) {
+          !timingsafe_bcmp(name, &strings.p[sources.p[i].name], len)) {
         return sources.p[i].id;
       }
       step++;
@@ -252,7 +252,7 @@ void LoadRelationships(int argc, char *argv[]) {
       CHECK_NE(-1, (rc = read(fd, buf, MAX_READ)));
       close(fd);
       size = rc;
-      memset(buf + size, 0, 16);
+      bzero(buf + size, 16);
       for (p = buf, pe = p + size; p < pe; ++p) {
         p = strstr(p, kIncludePrefix);
         if (!p) break;
@@ -385,7 +385,7 @@ int main(int argc, char *argv[]) {
     needprefix = !startswith(path, "o/");
     prefix = !needprefix ? "" : buildroot;
     fprintf(fout, "\n%s%s.o: \\\n\t%s", prefix, StripExt(path), path);
-    memset(visited, 0, bitmaplen);
+    bzero(visited, bitmaplen);
     bts(visited, i);
     Dive(i);
     fprintf(fout, "\n");