Copied ALSA config test into QtMultimedia module

The config test which still exists in QtBase should be removed at a
later date, together with pulseaudio and gstreamer config tests.

Change-Id: I4bea45ab69d1bac10814fc60ecf24dbc859b0f20
Reviewed-on: http://codereview.qt-project.org/6643
Reviewed-by: Ling Hu <ling.hu@nokia.com>
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>

config.tests/alsa/alsa.pro

@@ -0,0 +1,13 @@
+TEMPLATE = app
+DEPENDPATH += .
+INCLUDEPATH += .
+
+requires(unix)
+
+SOURCES = alsatest.cpp
+
+CONFIG -= qt dylib
+mac:CONFIG -= app_bundle
+
+LIBS+=-lasound
+