Simplify recording of main thread's ID on MS-Windows
* src/w32term.c (w32_initialize): * src/w32console.c (initialize_w32_display): * src/w32fns.c (globals_of_w32fns): Don't record the main thread ID independently for each type of session (GUI, TTY, batch). * src/w32term.c (w32_init_main_thread): New function, records the main thread's thread ID. * src/w32term.h: Add prototype for w32_init_main_thread. * src/emacs.c (main) [WINDOWSNT]: Call w32_init_main_thread. * src/emacs-module.c [WINDOWSNT]: Rename main_thread_id to main_thread, for consistency with other threading libraries. All users changed. Include w32term.h. (check_main_thread) [WINDOWSNT]: Simplify the test: no need to make sure the main thread is alive, as we hold a handle on it opened by w32_init_main_thread. (module_init) [WINDOWSNT]: Reuse the thread ID recorded by w32_init_main_thread, instead of calling the requisite APIs once more.
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