CROSS_TO_WASM build fix

A couple of option processing functions, one of which was called in file.c, were
recently added to sys/unix/unixmain.c, but the wasm build does not include unixmain.c,
it uses sys/libnh/libnhmain.c.

Transcribe the functions into sys/libnh/libnhmain.c.

Also, do not #include "wintty.h" for NOTTYGRAPHICS builds.

sys/libnh/libnhmain.c

@@ -51,6 +51,7 @@ extern void init_linux_cons(void);
 
 static void wd_message(void);
 static struct passwd *get_unix_pw(void);
+ATTRNORETURN static void opt_terminate(void) NORETURN;
 
 #ifdef __EMSCRIPTEN__
 /* if WebAssembly, export this API and don't optimize it out */
@@ -768,6 +769,32 @@ sys_random_seed(void)
     return seed;
 }
 
+/* for command-line options that perform some immediate action and then
+   terminate the program without starting play, like 'nethack --version'
+   or 'nethack -s Zelda'; do some cleanup before that termination */
+ATTRNORETURN static void
+opt_terminate(void)
+{
+    config_error_done(); /* free memory allocated by config_error_init() */
+
+    nh_terminate(EXIT_SUCCESS);
+    /*NOTREACHED*/
+}
+
+/* show the sysconf file name, playground directory, run-time configuration
+   file name, dumplog file name if applicable, and some other things */
+ATTRNORETURN void
+after_opt_showpaths(const char *dir)
+{
+#ifdef CHDIR
+    chdirx(dir, FALSE);
+#else
+    nhUse(dir);
+#endif
+    opt_terminate();
+    /*NOTREACHED*/
+}
+
 #ifdef __EMSCRIPTEN__
 /***
  * Helpers

sys/share/unixtty.c

@@ -11,7 +11,9 @@
 
 #define NEED_VARARGS
 #include "hack.h"
+#if defined(TTY_GRAPHICS) && !defined(NOTTYGRAPHICS)
 #include "wintty.h"
+#endif
 
 /*
  * The distinctions here are not BSD - rest but rather USG - rest, as