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

third_party/sqlite3/wal.c

@@ -574,8 +574,8 @@ static SQLITE_NOINLINE int walIndexPageRealloc(
       *ppPage = 0;
       return SQLITE_NOMEM_BKPT;
     }
-    memset((void*)&apNew[pWal->nWiData], 0,
-           sizeof(u32*)*(iPage+1-pWal->nWiData));
+    bzero((void*)&apNew[pWal->nWiData],
+          sizeof(u32*)*(iPage+1-pWal->nWiData));
     pWal->apWiData = apNew;
     pWal->nWiData = iPage+1;
   }
@@ -769,7 +769,7 @@ static void walEncodeFrame(
     sqlite3Put4byte(&aFrame[16], aCksum[0]);
     sqlite3Put4byte(&aFrame[20], aCksum[1]);
   }else{
-    memset(&aFrame[8], 0, 16);
+    bzero(&aFrame[8], 16);
   }
 }
 
@@ -1033,7 +1033,7 @@ static void walCleanupHash(Wal *pWal){
   ** frame numbers greater than pWal->hdr.mxFrame. 
   */
   nByte = (int)((char *)sLoc.aHash - (char *)&sLoc.aPgno[iLimit+1]);
-  memset((void *)&sLoc.aPgno[iLimit+1], 0, nByte);
+  bzero((void *)&sLoc.aPgno[iLimit+1], nByte);
 
 #ifdef SQLITE_ENABLE_EXPENSIVE_ASSERT
   /* Verify that the every entry in the mapping region is still reachable
@@ -1080,7 +1080,7 @@ static int walIndexAppend(Wal *pWal, u32 iFrame, u32 iPage){
     if( idx==1 ){
       int nByte = (int)((u8 *)&sLoc.aHash[HASHTABLE_NSLOT]
                                - (u8 *)&sLoc.aPgno[1]);
-      memset((void*)&sLoc.aPgno[1], 0, nByte);
+      bzero((void*)&sLoc.aPgno[1], nByte);
     }
 
     /* If the entry in aPgno[] is already set, then the previous writer