package/rpi-rgb-led-matrix: update to latest commit

The rpi-rgb-led-matrix project doesn't have tagged releases, so this
patch updates the package to the latest commit on the master branch.

Signed-off-by: J. Neuschäfer <j.neuschaefer@gmx.net>
[yann.morin.1998@free.fr: drop comment at end of _VERSION line]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/rpi-rgb-led-matrix/rpi-rgb-led-matrix.hash

@@ -1,3 +1,3 @@
 # Locally computed:
-sha256  490ca6fa0c81451f2472b4aa85796a876790f2e212bf0882e3bb7caf5c47e2c3  rpi-rgb-led-matrix-a56338db0f003d5236f2ce98c73a591d64a70852.tar.gz
+sha256  9a6da5b0ad730883a5fa18afc59b1297b4b05eb581c2c14ae50a3583296a4bed  rpi-rgb-led-matrix-f55736f7595bc028451658996eedea9742688bbc.tar.gz
 sha256  8177f97513213526df2cf6184d8ff986c675afb514d4e68a404010521b880643  COPYING

package/rpi-rgb-led-matrix/rpi-rgb-led-matrix.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-RPI_RGB_LED_MATRIX_VERSION = a56338db0f003d5236f2ce98c73a591d64a70852
+RPI_RGB_LED_MATRIX_VERSION = f55736f7595bc028451658996eedea9742688bbc
 RPI_RGB_LED_MATRIX_SITE = $(call github,hzeller,rpi-rgb-led-matrix,$(RPI_RGB_LED_MATRIX_VERSION))
 RPI_RGB_LED_MATRIX_LICENSE = GPL-2.0
 RPI_RGB_LED_MATRIX_LICENSE_FILES = COPYING