patch 8.2.0938: NFA regexp uses tolower ()to compare ignore-case

Problem:    NFA regexp uses tolower() to compare ignore-case. (Thayne McCombs)
Solution:   Use utf_fold() when possible. (ref. neovim #12456)
diff --git a/src/version.c b/src/version.c
index 922ab46..9f1cd00 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    938,
+/**/
     937,
 /**/
     936,