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/main.c

@@ -1036,6 +1036,10 @@ main (int argc, char **argv, char **envp)
 
 #undef  FATAL_SIG
 
+#ifndef NDEBUG
+  ShowCrashReports();
+#endif
+
   /* Do not ignore the child-death signal.  This must be done before
      any children could possibly be created; otherwise, the wait
      functions won't work on systems with the SVR4 ECHILD brain