Make more fixes and improvements

- Remove PAGESIZE constant
- Fix realloc() documentation
- Fix ttyname_r() error reporting
- Make forking more reliable on Windows
- Make execvp() a few microseconds faster
- Make system() a few microseconds faster
- Tighten up the socket-related magic numbers
- Loosen restrictions on mmap() offset alignment
- Improve GetProgramExecutableName() with getenv("_")
- Use mkstemp() as basis for mktemp(), tmpfile(), tmpfd()
- Fix flakes in pthread_cancel_test, unix_test, fork_test
- Fix recently introduced futex stack overflow regression
- Let sockets be passed as stdio to subprocesses on Windows
- Improve security of bind() on Windows w/ SO_EXCLUSIVEADDRUSE

third_party/make/strcache.c

@@ -253,7 +253,8 @@ strcache_add_len (const char *str, size_t len)
 void
 strcache_init (void)
 {
-  hash_init (&strings, 8000, str_hash_1, str_hash_2, str_hash_cmp);
+  // [jart] increased from 8000
+  hash_init (&strings, 131072, str_hash_1, str_hash_2, str_hash_cmp);
 }