patch 8.2.2807: build fails with tiny features

Problem:    Build fails with tiny features.
Solution:   Use a dummy function for ex_incdec().
diff --git a/src/version.c b/src/version.c
index 1931aae..842a7bc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2807,
+/**/
     2806,
 /**/
     2805,