patch 8.0.0260: build fails with tiny features

Problem:    Build fails with tiny features.
Solution:   Move get_tabpage_arg() inside #ifdef.
diff --git a/src/version.c b/src/version.c
index 05d2dd4..db2b53b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    260,
+/**/
     259,
 /**/
     258,