patch 8.2.0228: configure does not recognize gcc version on BSD

Problem:    Configure does not recognize gcc version on BSD.
Solution:   Do not use "\+" in the pattern matching the version number. (Ozaki
            Kiichi, closes #5590)
diff --git a/src/version.c b/src/version.c
index 82f1003..29c1614 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    228,
+/**/
     227,
 /**/
     226,