flannel: depends on CGO linking being supported

Fixes:

  http://autobuild.buildroot.net/results/3594f33800857cf57302f9b58e30d68f1d9c33b9/

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/flannel/Config.in

@@ -1,10 +1,12 @@
 comment "flannel needs a toolchain w/ threads"
-	depends on BR2_PACKAGE_HOST_GO_ARCH_SUPPORTS
+	depends on BR2_PACKAGE_HOST_GO_ARCH_SUPPORTS && \
+		BR2_PACKAGE_HOST_GO_CGO_LINKING_SUPPORTS
 	depends on !BR2_TOOLCHAIN_HAS_THREADS
 
 config BR2_PACKAGE_FLANNEL
 	bool "flannel"
 	depends on BR2_PACKAGE_HOST_GO_ARCH_SUPPORTS
+	depends on BR2_PACKAGE_HOST_GO_CGO_LINKING_SUPPORTS
 	depends on BR2_TOOLCHAIN_HAS_THREADS
 	help
 	  Flannel is a virtual network that gives a subnet to each