package/gcc: drop useless condition on BR2_GCC_ENABLE_GRAPHITE

For a long while now, we only support building GCC >= 8.x, so the
dependency of BR2_GCC_ENABLE_GRAPHITE on GCC >= 5.x is useless, drop
it, together with the corresponding Config.in comment.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/gcc/Config.in.host

@@ -128,10 +128,6 @@ config BR2_GCC_ENABLE_OPENMP
 
 config BR2_GCC_ENABLE_GRAPHITE
 	bool "Enable graphite support"
-	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_5
 	help
 	  This option enables the graphite optimizations in the
 	  compiler.
-
-comment "graphite support needs gcc >= 5.x"
-	depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_5