gnu: libmtp: Add additional MTP devices.

* gnu/packages/patches/libmtp-devices.patch: New file.
* gnu-system.am (dist_patch_DATA): Register patch.
* gnu/packages/patches/libmtp-devices.patch (libmtp)[source]: Add patch.

gnu-system.am

@@ -518,6 +518,7 @@ dist_patch_DATA =						\
   gnu/packages/patches/libbonobo-activation-test-race.patch	\
   gnu/packages/patches/libcanberra-sound-theme-freedesktop.patch \
   gnu/packages/patches/libevent-dns-tests.patch			\
+  gnu/packages/patches/libmtp-devices.patch			\
   gnu/packages/patches/liboop-mips64-deplibs-fix.patch		\
   gnu/packages/patches/liblxqt-include.patch			\
   gnu/packages/patches/libmad-armv7-thumb-pt1.patch		\

gnu/packages/libusb.scm

@@ -96,7 +96,8 @@ (define-public libmtp
                                  "/libmtp-" version ".tar.gz"))
              (sha256
                (base32
-                "12dinqic0ljnhrwx3rc61jc7q24ybr0mckc2ya5kh1s1np0d7w93"))))
+                "12dinqic0ljnhrwx3rc61jc7q24ybr0mckc2ya5kh1s1np0d7w93"))
+             (patches (list (search-patch "libmtp-devices.patch")))))
     (build-system gnu-build-system)
     (native-inputs
      `(("pkg-config" ,pkg-config)))