Handle integers in boolean expressions

Zero is false, all other values are true.

bin/varnishtest/tests/v00020.vtc

@@ -127,6 +127,16 @@ varnish v1 -vcl {
 	}
 }
 
+
+varnish v1 -vcl {
+	import std;
+	backend b { .host = "127.0.0.1"; }
+	sub vcl_recv {
+		if (std.integer("1", 1)) {
+		}
+	}
+}
+
 # XXX: not the most clear error message
 varnish v1 -errvcl {STRING - STRING not possible.} {
 	backend b { .host = "127.0.0.1"; }

lib/libvcc/vcc_expr.c

@@ -1200,7 +1200,9 @@ vcc_expr_cmp(struct vcc *tl, struct expr **e, vcc_type_t fmt)
 	default:
 		break;
 	}
-	if (fmt == BOOL && ((*e)->fmt == STRING || (*e)->fmt == BACKEND)) {
+	if (fmt == BOOL &&
+	    ((*e)->fmt == STRING || (*e)->fmt == BACKEND ||
+	     (*e)->fmt == INT)) {
 		*e = vcc_expr_edit(BOOL, "(\v1 != 0)", *e, NULL);
 		return;
 	}