libtorrent: use the proper BR2_TOOLCHAIN_HAS_SYNC_x symbols

libtorrent uses 1 bytes and 4 bytes __sync built-ins, so let's use the
appropriate BR2_TOOLCHAIN_HAS_SYNC_x symbols instead of
BR2_ARCH_HAS_ATOMICS. The rtorrent package, which is a reverse
dependency of libtorrent, gets fixed as well.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Tested-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
[yann.morin.1998@free.fr: build-tested on an ARC toolchain without
 atomics, with CPU 770D]
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

package/libtorrent/Config.in

@@ -2,7 +2,7 @@ config BR2_PACKAGE_LIBTORRENT
 	bool "libtorrent"
 	depends on BR2_INSTALL_LIBSTDCPP
 	depends on BR2_TOOLCHAIN_HAS_THREADS
-	depends on BR2_ARCH_HAS_ATOMICS
+	depends on BR2_TOOLCHAIN_HAS_SYNC_1 && BR2_TOOLCHAIN_HAS_SYNC_4
 	select BR2_PACKAGE_ZLIB
 	help
 	  BitTorrent library written in C++ for *nix
@@ -10,5 +10,5 @@ config BR2_PACKAGE_LIBTORRENT
 	  https://github.com/rakshasa/libtorrent
 
 comment "libtorrent needs a toolchain w/ C++, threads"
-	depends on BR2_ARCH_HAS_ATOMICS
+	depends on BR2_TOOLCHAIN_HAS_SYNC_1 && BR2_TOOLCHAIN_HAS_SYNC_4
 	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS

package/rtorrent/Config.in

@@ -4,7 +4,7 @@ config BR2_PACKAGE_RTORRENT
 	depends on BR2_USE_WCHAR
 	depends on BR2_TOOLCHAIN_HAS_THREADS
 	depends on BR2_USE_MMU # fork()
-	depends on BR2_ARCH_HAS_ATOMICS # libtorrent
+	depends on BR2_TOOLCHAIN_HAS_SYNC_1 && BR2_TOOLCHAIN_HAS_SYNC_4
 	select BR2_PACKAGE_LIBCURL
 	select BR2_PACKAGE_LIBTORRENT
 	select BR2_PACKAGE_NCURSES
@@ -16,5 +16,5 @@ config BR2_PACKAGE_RTORRENT
 
 comment "rtorrent needs a toolchain w/ C++, threads, wchar"
 	depends on BR2_USE_MMU
-	depends on BR2_ARCH_HAS_ATOMICS
+	depends on BR2_TOOLCHAIN_HAS_SYNC_1 && BR2_TOOLCHAIN_HAS_SYNC_4
 	depends on !(BR2_INSTALL_LIBSTDCPP && BR2_USE_WCHAR && BR2_TOOLCHAIN_HAS_THREADS)