Remove the legacy QML API.

This means no version 4.0 (which was never released) and no
Qt.multimediakit alternative import.

Change-Id: Iaacf047b0d72381a4a8cd975e036135ed11ea383
Reviewed-by: Ling Hu <ling.hu@nokia.com>

tests/auto/unit/multimedia.pro

@@ -31,7 +31,6 @@ SUBDIRS += \
     qwavedecoder \
     qaudiobuffer \
     qdeclarativeaudio \
-    qdeclarativeaudio_4 \
     qaudiodecoder \
     qaudioprobe \
     qvideoprobe \

tests/auto/unit/qdeclarativeaudio_4/qdeclarativeaudio_4.pro

@@ -1,17 +0,0 @@
-CONFIG += testcase
-TARGET = tst_qdeclarativeaudio_4
-
-QT += multimedia-private qml testlib
-CONFIG += no_private_qt_headers_warning
-
-HEADERS += \
-        $$QT.multimedia.sources/../imports/multimedia/qdeclarativeaudio_p_4.h \
-        $$QT.multimedia.sources/../imports/multimedia/qdeclarativemediabase_p_4.h \
-        $$QT.multimedia.sources/../imports/multimedia/qdeclarativemediametadata_p_4.h
-
-SOURCES += \
-        tst_qdeclarativeaudio_4.cpp \
-        $$QT.multimedia.sources/../imports/multimedia/qdeclarativeaudio_4.cpp \
-        $$QT.multimedia.sources/../imports/multimedia/qdeclarativemediabase_4.cpp
-
-INCLUDEPATH += $$QT.multimedia.sources/../imports/multimedia