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/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