kodi: fix libva toolchain comment

Documented syntax is '.. needs A toolchain ..'

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/kodi/Config.in

@@ -245,7 +245,7 @@ config BR2_PACKAGE_KODI_LIBVA
 	help
 	  Enable libva support.
 
-comment "libva support needs toolchain w/ dynamic library"
+comment "libva support needs a toolchain w/ dynamic library"
 	depends on BR2_STATIC_LIBS
 
 config BR2_PACKAGE_KODI_WAVPACK