patch 8.1.2186: error for bad regexp even though regexp is not used

Problem:    Error for bad regexp even though regexp is not used, when writing
            a file. (Arseny Nasokin)
Solution:   Ignore regexp errors. (closes #5059)

src/option.c

@@ -5812,8 +5812,8 @@ buf_copy_options(buf_T *buf, int flags)
 
 	if (should_copy || (flags & BCO_ALWAYS))
 	{
-	    vim_memset(buf->b_p_script_ctx, 0, sizeof(buf->b_p_script_ctx));
 #ifdef FEAT_EVAL
+	    vim_memset(buf->b_p_script_ctx, 0, sizeof(buf->b_p_script_ctx));
 	    init_buf_opt_idx();
 #endif
 	    // Don't copy the options specific to a help buffer when

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2186,
 /**/
     2185,
 /**/