patch 9.0.0637: syntax of commands in Vim9 script depends on +eval feature

Problem:    Syntax of commands in Vim9 script depends on +eval feature.
Solution:   Use same syntax with and without the +eval feature.

src/version.c

@@ -699,6 +699,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    637,
 /**/
     636,
 /**/