alsa-lib: make python option depend on python

As discussed on the list.

package/multimedia/alsa-lib/Config.in

@@ -9,7 +9,7 @@ config BR2_PACKAGE_ALSA_LIB
 config BR2_PACKAGE_ALSA_LIB_PYTHON
 	bool "Python support for alsa-lib"
 	depends on BR2_PACKAGE_ALSA_LIB
-	select BR2_PACKAGE_PYTHON
+	depends on BR2_PACKAGE_PYTHON
 	help
 	  Add python support for alsa-lib.
 	  Python will be built and libpython will be installed