toolchain/toolchain-common.in: adjust BR2_TOOLCHAIN_HAS_GCC_BUG_64735 for GCC 7

As GCC 7 is now available in Buildroot, update the definition for
BR2_TOOLCHAIN_HAS_GCC_BUG_64735 as the bug #64735 is fixed in GCC 7.

Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

toolchain/toolchain-common.in

@@ -17,6 +17,7 @@ config BR2_TOOLCHAIN_HAS_GCC_BUG_64735
 	default y if BR2_ARM_CPU_ARMV4
 	default y if BR2_ARM_CPU_ARMV5
 	default y if BR2_sparc_v8
+	depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_7
 
 config BR2_TOOLCHAIN_HAS_NATIVE_RPC
 	bool