m68k: gcc coldfire does not provide _sync atomics

Trying to use __sync_fetch_and_add ends with a gcc ICE.
This fixes following autobuild failure, by actually disabling
the package for coldfire:
http://autobuild.buildroot.net/results/d719db11210d42501332586b4485ab0cc1e125dd/

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

toolchain/toolchain-common.in

@@ -331,6 +331,7 @@ config BR2_TOOLCHAIN_HAS_SYNC_1
 	bool
 	default y
 	depends on !BR2_bfin
+	depends on !BR2_m68k_cf
 	depends on !BR2_microblaze
 	depends on !BR2_sparc
 	depends on !(BR2_arc && !BR2_ARC_ATOMIC_EXT)
@@ -342,6 +343,7 @@ config BR2_TOOLCHAIN_HAS_SYNC_2
 config BR2_TOOLCHAIN_HAS_SYNC_4
 	bool
 	default y
+	depends on !BR2_m68k_cf
 	depends on !BR2_sparc
 	depends on !(BR2_arc && !BR2_ARC_ATOMIC_EXT)