patch 8.2.4070: using uninitialized memory when reading empty file

Problem:    Using uninitialized memory when reading empty file.
Solution:   Check for empty file before checking for NL. (Dominique Pellé,
            closes #9511)
diff --git a/src/version.c b/src/version.c
index a931516..8c77e2e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4070,
+/**/
     4069,
 /**/
     4068,