package/aumix: update AUMIX_SITE

The old URL gives 403 forbidden.
Use a working sourceforge URL.

Fixes:

  http://autobuild.buildroot.org/results/c0c3945cade7a6d7a615ac23523c93b02dbb056f

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 77512bba98e09c7231a2629652e464dbf882fd23)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/aumix/Config.in

@@ -9,4 +9,4 @@ config BR2_PACKAGE_AUMIX
 	  automatically save and restore the mixer settings at shutdown
 	  and boot.
 
-	  http://jpj.net/~trevor/aumix.html
+	  https://sourceforge.net/projects/aumix/

package/aumix/aumix.mk

@@ -6,7 +6,7 @@
 
 AUMIX_VERSION = 2.9.1
 AUMIX_SOURCE = aumix-$(AUMIX_VERSION).tar.bz2
-AUMIX_SITE = http://jpj.net/~trevor/aumix/releases
+AUMIX_SITE = https://sourceforge.net/projects/aumix/files/aumix/$(AUMIX_VERSION)
 AUMIX_AUTORECONF = YES
 AUMIX_AUTOPOINT = YES
 AUMIX_LICENSE = GPL-2.0+