package/libphidget: fix upstream source URL

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
(cherry picked from commit dc9cc4d7cfb7dcd4a450e6bafe010b19f4c85e78)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libphidget/libphidget.mk

@@ -6,7 +6,7 @@
 
 LIBPHIDGET_VERSION = 2.1.8.20140319
 LIBPHIDGET_SOURCE = libphidget_$(LIBPHIDGET_VERSION).tar.gz
-LIBPHIDGET_SITE = http://www.phidgets.com/downloads/libraries
+LIBPHIDGET_SITE = https://www.phidgets.com/downloads/phidget21/libraries/linux/libphidget
 LIBPHIDGET_DEPENDENCIES = libusb
 LIBPHIDGET_CONF_OPTS = --disable-ldconfig
 LIBPHIDGET_INSTALL_STAGING = YES