patch 8.1.1887: the +cmdline_compl feature is not in the tiny version

Problem:    The +cmdline_compl feature is not in the tiny version.
Solution:   Graduate the +cmdline_compl feature.
diff --git a/src/structs.h b/src/structs.h
index 97b1299..41f6036 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -555,7 +555,7 @@
     int		xp_context;		// type of expansion
     char_u	*xp_pattern;		// start of item to expand
     int		xp_pattern_len;		// bytes in xp_pattern before cursor
-#if defined(FEAT_EVAL) && defined(FEAT_CMDL_COMPL)
+#if defined(FEAT_EVAL)
     char_u	*xp_arg;		// completion function
     sctx_T	xp_script_ctx;		// SCTX for completion function
 #endif