Move usage() to be with run() in x.c

run/usage/xinit are now all internal to x.c

Signed-off-by: Devin J. Pohly <djpohly@gmail.com>

st.c

@@ -28,8 +28,6 @@
 #include <X11/cursorfont.h>
 #include <X11/Xft/Xft.h>
 
-char *argv0;
-
 #define Glyph Glyph_
 #define Font Font_
 
@@ -2687,16 +2685,3 @@ cresize(int width, int height)
 	tresize(col, row);
 	xresize(col, row);
 }
-
-void
-usage(void)
-{
-	die("usage: %s [-aiv] [-c class] [-f font] [-g geometry]"
-	    " [-n name] [-o file]\n"
-	    "          [-T title] [-t title] [-w windowid]"
-	    " [[-e] command [args ...]]\n"
-	    "       %s [-aiv] [-c class] [-f font] [-g geometry]"
-	    " [-n name] [-o file]\n"
-	    "          [-T title] [-t title] [-w windowid] -l line"
-	    " [stty_args ...]\n", argv0, argv0);
-}