patch 8.2.2237: CI on Mac fails in sed command

Problem:    CI on Mac fails in sed command.
Solution:   Set LC_ALL to "C". (Ozaki Kiichi, closes #7565)

.github/workflows/ci.yml

@@ -291,7 +291,7 @@ jobs:
 
       - name: Build
         env:
-          LANG: C
+          LC_ALL: C
         run: |
           make -j${NPROC}
 

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2237,
 /**/
     2236,
 /**/