patch 8.2.2213: checking white space around -> is not backwards compatible

Problem:    Checking white space around -> is not backwards compatible.
Solution:   Only check white space around =>.
diff --git a/src/version.c b/src/version.c
index 75a1e4b..2a85bb3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2213,
+/**/
     2212,
 /**/
     2211,