patch 7.4.2127

Problem:    The short form of ":noswapfile" is ":noswap" instead of ":now".
            (Kent Sibilev)
Solution:   Only require three characters.  Add a test for the short forms.

src/version.c

@@ -763,6 +763,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2127,
 /**/
     2126,
 /**/