vim-patch:7.4.1708

Problem:    New regexp engine does not work properly with EBCDIC.
Solution:   Define equivalence class characters. (Owen Leibman)

2a6fa564a3

Although nvim doesn't support EBCDIC systems, this keeps us inline with
upstream code so its easier to merge future patches in this area and
improves the readability of the code.

src/nvim/version.c

@@ -736,7 +736,7 @@ static int included_patches[] = {
   1711,
   // 1710 NA
   // 1709 NA
-  // 1708,
+  1708,
   1707,
   // 1706 NA
   // 1705 NA