[honu] add syntax-rules analog

collects/honu/syntax.rkt

@@ -0,0 +1,10 @@
+#lang honu
+
+/* Standard syntax-rules but as a macro-defining form */
+
+provide macro_rules;
+macro macro_rules(){
+  name:identifier (literal ...){ pattern ... }{ template ... }
+} {
+  syntax(macro name (literal ...){ pattern ... }{ syntax(template ...) })
+}