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/rand/measureentropy.c

@@ -21,7 +21,7 @@
 #include "libc/str/str.h"
 
 /**
- * Returns number between 0 and 8.
+ * Returns Shannon entropy of array.
  *
  * This gives you an idea of the density of information. Cryptographic
  * random should be in the ballpark of 7.9 whereas plaintext will be
@@ -29,6 +29,7 @@
  *
  * @param p is treated as binary octets
  * @param n should be at least 1000
+ * @return number between 0 and 8
  */
 double MeasureEntropy(const char *p, size_t n) {
   size_t i;
@@ -36,7 +37,7 @@ double MeasureEntropy(const char *p, size_t n) {
   long h[256];
   e = 0;
   if (n) {
-    memset(h, 0, sizeof(h));
+    bzero(h, sizeof(h));
     for (i = 0; i < n; ++i) {
       ++h[p[i] & 255];
     }