patch 8.2.3587: compiler test fails with backslash file separator

Problem:    Compiler test fails with backslash file separator.
Solution:   Accept slash and backslash.
diff --git a/src/version.c b/src/version.c
index 040fbb6..65d9d10 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3587,
+/**/
     3586,
 /**/
     3585,