patch 8.0.0674: cannot build with eval but without timers

Problem:    Cannot build with eval but without timers.
Solution:   Add #ifdef (John Marriott)
diff --git a/src/version.c b/src/version.c
index b9f309d..fa4f6fb 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    674,
+/**/
     673,
 /**/
     672,