Make improvements

- Invent openatemp() API
- Invent O_UNLINK open flag
- Introduce getenv_secure() API
- Remove `git pull` from cosmocc
- Fix utimes() when path is NULL
- Fix mktemp() to never return NULL
- Fix utimensat() UTIME_OMIT on XNU
- Improve utimensat() code for RHEL5
- Turn `argv[0]` C:/ to /C/ on Windows
- Introduce tmpnam() and tmpnam_r() APIs
- Fix more const issues with internal APIs
- Permit utimes() on WIN32 in O_RDONLY mode
- Fix fdopendir() to check fd is a directory
- Fix recent crash regression in landlock make
- Fix futimens(AT_FDCWD, NULL) to return EBADF
- Use workaround so `make -j` doesn't fork bomb
- Rename dontdiscard to __wur (just like glibc)
- Fix st_size for WIN32 symlinks containing UTF-8
- Introduce stdio ext APIs needed by GNU coreutils
- Fix lstat() on WIN32 for symlinks to directories
- Move some constants from normalize.inc to limits.h
- Fix segv with memchr() and memcmp() overlapping page
- Implement POSIX fflush() behavior for reader streams
- Implement AT_SYMLINK_NOFOLLOW for utimensat() on WIN32
- Don't change read-only status of existing files on WIN32
- Correctly handle `0x[^[:xdigit:]]` case in strtol() functions

libc/stdio/internal.h

@@ -10,7 +10,7 @@ COSMOPOLITAN_C_START_
 
 struct FILE {
   uint8_t bufmode;      /* 0x00 _IOFBF, etc. (ignored if fd=-1) */
-  bool noclose;         /* 0x01 for fake dup() todo delete! */
+  char noclose;         /* 0x01 for fake dup() todo delete! */
   uint32_t iomode;      /* 0x04 O_RDONLY, etc. (ignored if fd=-1) */
   int32_t state;        /* 0x08 0=OK, -1=EOF, >0=errno */
   int fd;               /* 0x0c ≥0=fd, -1=closed|buffer */