Make improvements

- Fix build flakes
- Polyfill SIGWINCH on Windows
- Fix an execve issue on Windows
- Make strerror show more information
- Improve cmd.exe setup/teardown on Windows
- Support bracketed paste mode in Blinkenlights
- Show keyboard shortcuts in Blinkenlights status bar
- Fixed copy_file_range() and copyfile() w/ zip filesystem
- Size optimize GetDosArgv() to keep life.com 12kb in size
- Improve Blinkenlights ability to load weird ELF executables
- Fix program_executable_name and add GetInterpreterExecutableName
- Make Python in tiny mode fail better if docstrings are requested
- Update Python test exclusions in tiny* modes such as tinylinux
- Add bulletproof unbreakable kprintf() troubleshooting function
- Remove "oldskool" keyword from ape.S for virus scanners
- Fix issue that caused backtraces to not print sometimes
- Improve Blinkenlights serial uart character i/o
- Make clock_gettime() not clobber errno on xnu
- Improve sha256 cpuid check for old computers
- Integrate some bestline linenoise fixes
- Show runit process names better in htop
- Remove SIGPIPE from ShowCrashReports()
- Make realpath() not clobber errno
- Avoid attaching GDB on non-Linux
- Improve img.com example

third_party/mbedtls/sha256.c

@@ -175,15 +175,17 @@ int mbedtls_internal_sha256_process( mbedtls_sha256_context *ctx,
 
     if( !IsTiny() || X86_NEED( SHA ) )
     {
-        if( X86_HAVE( SHA ) )
+        if( X86_HAVE( SHA ) &&
+            X86_HAVE( SSE2 ) &&
+            X86_HAVE( SSSE3 ) )
         {
             if( IsAsan() )
                 __asan_verify( data, 64 );
             sha256_transform_ni( ctx->state, data, 1 );
             return( 0 );
         }
-        if( X86_HAVE( BMI  ) &&
-            X86_HAVE( BMI2 ) &&
+        if( X86_HAVE( BMI2 ) &&
+            X86_HAVE( AVX  ) &&
             X86_HAVE( AVX2 ) )
         {
             if( IsAsan() )
@@ -310,7 +312,10 @@ int mbedtls_sha256_update_ret( mbedtls_sha256_context *ctx,
 
     if( ilen >= 64 )
     {
-        if( ( !IsTiny() || X86_NEED( SHA ) ) && X86_HAVE( SHA ) )
+        if( !IsTiny() &&
+            X86_HAVE( SHA ) &&
+            X86_HAVE( SSE2 ) &&
+            X86_HAVE( SSSE3 ) )
         {
             if( IsAsan() )
                 __asan_verify( input, ilen );