package/alsa-lib: smixer-python module supports python3

Add simple mixer python bindings to build when "Python support for
alsa-lib" is active. smixer-python is the only python module which
exists in alsa-lib. It is compatible with Python2 and Python3.

Signed-off-by: Illia Bitkov <illia.bitkov@mind.be>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit fde3bf94b105d94d3d9a04acb11ee31f6e73f11d)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/alsa-lib/Config.in

@@ -22,7 +22,7 @@ if BR2_PACKAGE_ALSA_LIB
 
 config BR2_PACKAGE_ALSA_LIB_PYTHON
 	bool "Python support for alsa-lib"
-	depends on BR2_PACKAGE_PYTHON
+	depends on BR2_PACKAGE_PYTHON || BR2_PACKAGE_PYTHON3
 	help
 	  Add python support for alsa-lib.
 	  Python will be built and libpython will be installed

package/alsa-lib/alsa-lib.mk

@@ -57,12 +57,22 @@ ALSA_LIB_CONF_OPTS += --disable-old-symbols
 endif
 
 ifeq ($(BR2_PACKAGE_ALSA_LIB_PYTHON),y)
+ALSA_LIB_CONF_OPTS += \
+	--enable-mixer-pymods
+ifeq ($(BR2_PACKAGE_PYTHON),y)
 ALSA_LIB_CONF_OPTS += \
 	--with-pythonlibs=-lpython$(PYTHON_VERSION_MAJOR) \
 	--with-pythonincludes=$(STAGING_DIR)/usr/include/python$(PYTHON_VERSION_MAJOR)
 ALSA_LIB_CFLAGS += -I$(STAGING_DIR)/usr/include/python$(PYTHON_VERSION_MAJOR)
 ALSA_LIB_DEPENDENCIES = python
 else
+ALSA_LIB_CONF_OPTS += \
+	--with-pythonlibs=-lpython$(PYTHON3_VERSION_MAJOR) \
+	--with-pythonincludes=$(STAGING_DIR)/usr/include/python$(PYTHON3_VERSION_MAJOR)
+ALSA_LIB_CFLAGS += -I$(STAGING_DIR)/usr/include/python$(PYTHON3_VERSION_MAJOR)
+ALSA_LIB_DEPENDENCIES = python3
+endif
+else
 ALSA_LIB_CONF_OPTS += --disable-python
 endif