mg(1) - file names with spaces

[Mark Lumsden]

In older versions of emacs when you try to find a file (C-x C-f) and
press a space character while typing the file name, emacs tries to
complete the name (like pressing tab).  However, later versions have
stopped this behaviour which allows you to open a file with a space in
the name. 

mg currently follows emacs older behaviour. This diff changes mg to
mimic newer versions. 

ok/comments?

-lum

Index: echo.c
===================================================================
RCS file: /cvs/src/usr.bin/mg/echo.c,v
retrieving revision 1.50
diff -u -p -r1.50 echo.c
--- echo.c      12 Apr 2012 04:47:59 -0000      1.50
+++ echo.c      23 Sep 2012 15:54:10 -0000
@@ -184,7 +184,7 @@ veread(const char *fp, char *buf, size_t
        ttflush();
        for (;;) {
                c = getkey(FALSE);
-               if ((flag & EFAUTO) != 0 && (c == ' ' || c == CCHR('I'))) {
+               if ((flag & EFAUTO) != 0 && c == CCHR('I')) {
                        if (cplflag == TRUE) {
                                complt_list(flag, buf, cpos);
                                cwin = TRUE;