package/kodi-visualisation-shadertoy: needs libglew for OpenGL build

Fixes
-- Found OpenGL: /home/bernd/buildroot/output/host/usr/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/lib/libGL.so
CMake Error at /home/bernd/buildroot/output/host/usr/share/cmake-3.5/Modules/FindPackageHandleStandardArgs.cmake:148
 (message):
  Could NOT find GLEW (missing: GLEW_INCLUDE_DIRS GLEW_LIBRARIES)

For details have a look at
https://github.com/notspiff/visualization.shadertoy/blob/master/CMakeLists.txt#L21

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/kodi-visualisation-shadertoy/Config.in

@@ -1,5 +1,6 @@
 config BR2_PACKAGE_KODI_VISUALISATION_SHADERTOY
 	bool "kodi-visualisation-shadertoy"
+	select BR2_PACKAGE_LIBGLEW if BR2_PACKAGE_HAS_LIBGL
 	select BR2_PACKAGE_LIBPLATFORM
 	help
 	  Shadertoy visualiser for Kodi

package/kodi-visualisation-shadertoy/kodi-visualisation-shadertoy.mk

@@ -10,4 +10,8 @@ KODI_VISUALISATION_SHADERTOY_LICENSE = GPLv2+
 KODI_VISUALISATION_SHADERTOY_LICENSE_FILES = src/main.cpp
 KODI_VISUALISATION_SHADERTOY_DEPENDENCIES = kodi libplatform
 
+ifeq ($(BR2_PACKAGE_LIBGLEW),y)
+KODI_VISUALISATION_SHADERTOY_DEPENDENCIES += libglew
+endif
+
 $(eval $(cmake-package))