patch 8.0.1189: E172 is not actually useful

Problem:    E172 is not actually useful, it's only on Unix anyway.
Solution:   Remove the check and the error.
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index e2dfd92..bb1ae46 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -5085,29 +5085,6 @@
 	{
 	    if (n == 2)
 	    {
-#ifdef UNIX
-		/*
-		 * Only for Unix we check for more than one file name.
-		 * For other systems spaces are considered to be part
-		 * of the file name.
-		 * Only check here if there is no wildcard, otherwise
-		 * ExpandOne() will check for errors. This allows
-		 * ":e `ls ve*.c`" on Unix.
-		 */
-		if (!has_wildcards)
-		    for (p = eap->arg; *p; ++p)
-		    {
-			/* skip escaped characters */
-			if (p[1] && (*p == '\\' || *p == Ctrl_V))
-			    ++p;
-			else if (VIM_ISWHITE(*p))
-			{
-			    *errormsgp = (char_u *)_("E172: Only one file name allowed");
-			    return FAIL;
-			}
-		    }
-#endif
-
 		/*
 		 * Halve the number of backslashes (this is Vi compatible).
 		 * For Unix and OS/2, when wildcards are expanded, this is
diff --git a/src/version.c b/src/version.c
index 8742035..451eb36 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1189,
+/**/
     1188,
 /**/
     1187,