patch 8.2.1180: build failure in small version

Problem:    Build failure in small version.
Solution:   Add #ifdef.
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 692192b..5436373 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -2750,10 +2750,11 @@
 				if (*p == NUL || ends_excmd(*p))
 				    break;
 			    }
+#ifdef FEAT_EVAL
 			    // Avoid that "filter(arg)" is recognized.
 			    if (in_vim9script() && !VIM_ISWHITE(*p))
 				break;
-
+#endif
 			    if (skip_only)
 				p = skip_vimgrep_pat(p, NULL, NULL);
 			    else