fix hexadecimal constants + freestanding fixes

vlib/compiler/tests/enum_hex_test.v

@@ -0,0 +1,33 @@
+enum w_hex {
+	a = 0x001
+	b = 0x010
+	c = 0x100
+}
+
+enum w_decimal {
+	a = 1
+	b = 16
+	c = 256
+}
+
+const (
+	ca = 1
+	cb = 16
+	cc = 256
+)
+
+
+fn test_enum_hex() {
+	assert ca == int(w_decimal.a)
+	assert cb == int(w_decimal.b)
+	assert cc == int(w_decimal.c)
+
+	assert int(w_hex.a) == ca
+	assert int(w_hex.b) == cb
+	assert int(w_hex.c) == cc
+
+	assert int(w_hex.a) == int(w_decimal.a)
+	assert int(w_hex.b) == int(w_decimal.b)
+	assert int(w_hex.c) == int(w_decimal.c)
+}
+