patch 8.2.1254: MS-Windows: regexp test may fail if 'iskeyword' set wrongly

Problem:    MS-Windows: regexp test may fail if 'iskeyword' set wrongly.
Solution:   Override the 'iskeyword' value. (Taro Muraoka, closes #6502)
diff --git a/src/version.c b/src/version.c
index daec765..8cedb1c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1254,
+/**/
     1253,
 /**/
     1252,