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

libc/calls/readv-serial.c

@@ -35,21 +35,12 @@ static int GetFirstIov(struct iovec *iov, int iovlen) {
 }
 
 ssize_t sys_readv_serial(struct Fd *fd, const struct iovec *iov, int iovlen) {
-  size_t i, j, got = 0;
+  size_t i;
   if ((i = GetFirstIov(iov, iovlen)) != -1) {
     while (!IsDataAvailable(fd)) asm("pause");
-    i = 0;
-    j = 0;
-    do {
-      ++got;
-      ((char *)iov[i].iov_base)[j] = inb(fd->handle);
-      if (++j == iov[i].iov_len) {
-        j = 0;
-        if (++i == iovlen) {
-          break;
-        }
-      }
-    } while (IsDataAvailable(fd));
+    ((char *)iov[i].iov_base)[0] = inb(fd->handle);
+    return 1;
+  } else {
+    return 0;
   }
-  return got;
 }