Add basic lexenv support

src/base.h

@@ -282,6 +282,10 @@ static ALWAYS_INLINE bool NILP(LispVal *val) {
     return val == Qnil;
 }
 
+static ALWAYS_INLINE bool EQ(LispVal *val1, LispVal *val2) {
+    return val1 == val2;
+}
+
 // Some core functions
 DECLARE_FUNCTION(id, (LispVal * obj));
 DECLARE_FUNCTION(eq, (LispVal * obj1, LispVal *obj2));