patch 7.4.2088

Problem:    Keymap test fails with normal features.
Solution:   Bail out if the keymap feature is not supported.

src/testdir/test_digraph.vim

@@ -437,6 +437,9 @@ func! Test_digraphs_output()
 endfunc
 
 func! Test_loadkeymap()
+  if !has('keymap')
+    return
+  endif
   new
   set keymap=czech
   set iminsert=0

src/version.c

@@ -758,6 +758,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2088,
 /**/
     2087,
 /**/