patch 8.2.0297: compiler warnings for the Ruby interface

Problem:    Compiler warnings for the Ruby interface.
Solution:   Undefine a few macros, fix initialization. (Ozaki Kiichi,
            closes #5677)
diff --git a/src/version.c b/src/version.c
index 5eb0d05..aa9ff36 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    297,
+/**/
     296,
 /**/
     295,