patch 8.1.1115: cannot build with older C compiler

Problem:    Cannot build with older C compiler.
Solution:   Move variable declaration to start of block.
diff --git a/src/version.c b/src/version.c
index 0b86e19..9f65ca6 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1115,
+/**/
     1114,
 /**/
     1113,