zeroconf/mdnssd: build the fallback daemon on all linux flavors

Change-Id: Ie70fe778611bf4e6d48ed7e7e766dac4daf1eef2
Reviewed-by: Christian Kandeler <christian.kandeler@nokia.com>

src/tools/tools.pro

@@ -9,7 +9,7 @@ SUBDIRS += qmlpuppet
     SUBDIRS += valgrindfake
 }
 
-linux-g++ {
+linux-* {
     SUBDIRS += mdnssd
 }