package/tvheadend: needs __sync_*_8 intrisics

Fixes:
http://autobuild.buildroot.net/results/992/99235aa2aca1afe031a088baebbd46057fe75fcd/

/home/autobuild/autobuild/instance-15/output-1/build/tvheadend-fe47ecb5504a521fed9c1ca9705fb0dd2bb8443a/src/atomic.h:253:
 undefined reference to `__sync_lock_test_and_set_8'
/home/autobuild/autobuild/instance-15/output-1/build/tvheadend-fe47ecb5504a521fed9c1ca9705fb0dd2bb8443a/src/atomic.h:81:
 undefined reference to `__sync_fetch_and_add_8'

The build error was introduced by the latest bump of tvheadend with
commit 67cbbbfe6e9632deacd0784bdbf51496ad76701d.

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/tvheadend/Config.in

@@ -1,14 +1,14 @@
 comment "tvheadend needs a toolchain w/ NPTL, headers >= 3.2, dynamic library"
 	depends on !BR2_TOOLCHAIN_HAS_THREADS_NPTL || \
 		!BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2 || BR2_STATIC_LIBS
-	depends on BR2_TOOLCHAIN_HAS_SYNC_4
+	depends on BR2_TOOLCHAIN_HAS_SYNC_8
 
 menuconfig BR2_PACKAGE_TVHEADEND
 	bool "tvheadend"
 	depends on !BR2_STATIC_LIBS # dladdr()
 	depends on BR2_TOOLCHAIN_HAS_THREADS_NPTL
 	depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2
-	depends on BR2_TOOLCHAIN_HAS_SYNC_4
+	depends on BR2_TOOLCHAIN_HAS_SYNC_8
 	select BR2_PACKAGE_DTV_SCAN_TABLES
 	select BR2_PACKAGE_LIBICONV if !BR2_ENABLE_LOCALE
 	select BR2_PACKAGE_OPENSSL