package/azure-iot-sdk-c: format the libraries list with one lib per line

This makes it easier to review patches modifying these lists of
libraries, such as:

  http://patchwork.ozlabs.org/project/buildroot/patch/20190923115206.4468-1-stephan.hoffmann@ext.grandcentrix.net/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit c71030f0fab49be4061fb999a8eabe4190f1f18d)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/azure-iot-sdk-c/azure-iot-sdk-c.mk

@@ -17,21 +17,31 @@ AZURE_IOT_SDK_C_CONF_OPTS = -Dskip_samples=ON
 # The project only supports building one kind of library.
 # Further the install target installs the wrong files, so we do it here:
 ifeq ($(BR2_STATIC_LIBS),y)
-AZURE_IOT_SDK_C_LIBS += uamqp/libuamqp.a c-utility/libaziotsharedutil.a \
-	iothub_client/libiothub_client.a iothub_client/libiothub_client_mqtt_ws_transport.a \
+AZURE_IOT_SDK_C_LIBS += \
+	uamqp/libuamqp.a \
+	c-utility/libaziotsharedutil.a \
+	iothub_client/libiothub_client.a \
+	iothub_client/libiothub_client_mqtt_ws_transport.a \
 	iothub_client/libiothub_client_amqp_ws_transport.a \
 	iothub_client/libiothub_client_http_transport.a \
 	iothub_client/libiothub_client_amqp_transport.a \
 	iothub_client/libiothub_client_mqtt_transport.a \
-	iothub_service_client/libiothub_service_client.a serializer/libserializer.a umqtt/libumqtt.a
+	iothub_service_client/libiothub_service_client.a \
+	serializer/libserializer.a \
+	umqtt/libumqtt.a
 else
-AZURE_IOT_SDK_C_LIBS += uamqp/libuamqp.so c-utility/libaziotsharedutil.so \
-	iothub_client/libiothub_client.so iothub_client/libiothub_client_mqtt_ws_transport.so \
+AZURE_IOT_SDK_C_LIBS += \
+	uamqp/libuamqp.so \
+	c-utility/libaziotsharedutil.so \
+	iothub_client/libiothub_client.so \
+	iothub_client/libiothub_client_mqtt_ws_transport.so \
 	iothub_client/libiothub_client_amqp_ws_transport.so \
 	iothub_client/libiothub_client_http_transport.so \
 	iothub_client/libiothub_client_amqp_transport.so \
 	iothub_client/libiothub_client_mqtt_transport.so \
-	iothub_service_client/libiothub_service_client.so serializer/libserializer.so umqtt/libumqtt.so
+	iothub_service_client/libiothub_service_client.so \
+	serializer/libserializer.so \
+	umqtt/libumqtt.so
 endif
 
 define AZURE_IOT_SDK_C_INSTALL_STAGING_CMDS