trinity: needs __sync_val_compare_and_swap_4

syscalls/futex.c uses sync_val_compare_and_swap(). So add dependency on
BR2_TOOLCHAIN_HAS_SYNC_4.

Fixes:
  http://autobuild.buildroot.net/results/17f/17f7fe79242a40ff3e588748230de7bf2a010941

Signed-off-by: Rahul Bedarkar <rahulbedarkar89@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/trinity/Config.in

@@ -2,6 +2,7 @@ config BR2_PACKAGE_TRINITY_ARCH_SUPPORTS
 	bool
 	default y
 	depends on BR2_USE_MMU # fork()
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4 # __sync_val_compare_and_swap_4
 	depends on BR2_aarch64 || BR2_arm || BR2_armeb || BR2_i386 || \
 		BR2_mips || BR2_mipsel || BR2_powerpc || BR2_powerpc64 || \
 		BR2_powerpc64le || BR2_sparc || BR2_x86_64