package/libusbgx: bump to version 0.3.0

After a long time, upstream has made an actual release, which also
contains a number of bugfixes/improvements. Switch to it instead of
using a random git commit.

Changelog: https://github.com/linux-usb-gadgets/libusbgx/releases/tag/libusbgx-v0.3.0

Signed-off-by: Florian Larysch <larysch@fixme.gmbh>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/libusbgx/libusbgx.hash

@@ -1,4 +1,4 @@
 # Locally computed:
-sha256  d0b483d8b190a75a1f9b52d6db229de5580c78b201077361a524cf32c5aad517  libusbgx-a5bfa81017a9b2064bc449cf74f5f9d106445f62.tar.gz
+sha256  23d72c415ffd80d752efccc9bb5a6afdece6a83a31975344ef31a4967d189e3c  libusbgx-0.3.0.tar.gz
 sha256  8177f97513213526df2cf6184d8ff986c675afb514d4e68a404010521b880643  COPYING
 sha256  dc626520dcd53a22f727af3ee42c770e56c97a64fe3adb063799d8ab032fe551  COPYING.LGPL

package/libusbgx/libusbgx.mk

@@ -4,8 +4,8 @@
 #
 ################################################################################
 
-LIBUSBGX_VERSION = a5bfa81017a9b2064bc449cf74f5f9d106445f62
-LIBUSBGX_SITE = $(call github,linux-usb-gadgets,libusbgx,$(LIBUSBGX_VERSION))
+LIBUSBGX_VERSION = 0.3.0
+LIBUSBGX_SITE = $(call github,linux-usb-gadgets,libusbgx,libusbgx-v$(LIBUSBGX_VERSION))
 LIBUSBGX_LICENSE = GPL-2.0+ (examples), LGPL-2.1+ (library)
 LIBUSBGX_LICENSE_FILES = COPYING COPYING.LGPL
 LIBUSBGX_DEPENDENCIES = host-pkgconf libconfig