Add `+ignore` along with `+build ignore`

src/parser.cpp

@@ -5584,6 +5584,8 @@ gb_internal bool parse_file(Parser *p, AstFile *f) {
 						if (!parse_build_tag(tok, lc)) {
 							return false;
 						}
+					} else if (string_starts_with(lc, str_lit("+ignore"))) {
+							return false;
 					} else if (string_starts_with(lc, str_lit("+private"))) {
 						f->flags |= AstFile_IsPrivatePkg;
 						String command = string_trim_starts_with(lc, str_lit("+private "));