mdnssd: suppress warnings in 3. party code

Change-Id: I4468dda5b8050839230ad8852e336b913fdba083
Reviewed-by: Kai Koehne <kai.koehne@nokia.com>

src/tools/mdnssd/mdnssd.pro

@@ -45,7 +45,7 @@ HEADERS +=\
 }
 
 *-g++ {
-    QMAKE_CFLAGS += -Wno-unused-but-set-variable
+    QMAKE_CFLAGS += -Wno-unused-but-set-variable -Wno-strict-aliasing
     QMAKE_CXXFLAGS += -Wno-unused-but-set-variable
 }