vim-patch:7.4.2121

Problem:    No easy way to check if lambda and closure are supported.
Solution:   Add the +lambda feature.

9532fe7fbe

src/nvim/version.c

@@ -319,7 +319,7 @@ static int included_patches[] = {
   2124,
   2123,
   // 2122 NA
-  // 2121,
+  2121,
   2120,
   2119,
   // 2118 NA