patch 8.0.0848: using multiple ch_log functions is clumsy

Problem:    Using multiple ch_log functions is clumsy.
Solution:   Use variable arguments. (Ozaki Kiichi, closes #1919)
diff --git a/src/version.c b/src/version.c
index 0d144bb..ae8d0b7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    848,
+/**/
     847,
 /**/
     846,