Fix unused parameters

Change-Id: Iafad6313fcf74e42c11628ce9ee0f797abfcb6ca
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

src/corelib/tools/qsimd.cpp

@@ -290,6 +290,10 @@ static void cpuidFeatures07_00(uint &ebx, uint &ecx, uint &edx)
     ebx = info[1];
     ecx = info[2];
     edx = info[3];
+#else
+    Q_UNUSED(ebx);
+    Q_UNUSED(ecx);
+    Q_UNUSED(edx);
 #endif
 }