libtorrent: needs threads support

Fixes http://autobuild.buildroot.net/results/25e6a0a65d0b75050e02a5748b3f08a80b686188

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/libtorrent/Config.in

@@ -1,11 +1,12 @@
 config BR2_PACKAGE_LIBTORRENT
 	bool "libtorrent"
 	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_TOOLCHAIN_HAS_THREADS
 	select BR2_PACKAGE_LIBSIGC
 	help
 	  BitTorrent library written in C++ for *nix
 
 	  http://libtorrent.rakshasa.no/
 
-comment "libtorrent requires a toolchain with C++ support enabled"
-	depends on !BR2_INSTALL_LIBSTDCPP
+comment "libtorrent requires a toolchain with C++ and threads support enabled"
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS

package/rtorrent/Config.in

@@ -2,6 +2,7 @@ config BR2_PACKAGE_RTORRENT
 	bool "rtorrent"
 	depends on BR2_INSTALL_LIBSTDCPP
 	depends on BR2_USE_WCHAR
+	depends on BR2_TOOLCHAIN_HAS_THREADS
 	select BR2_PACKAGE_LIBCURL
 	select BR2_PACKAGE_LIBSIGC
 	select BR2_PACKAGE_LIBTORRENT
@@ -12,5 +13,5 @@ config BR2_PACKAGE_RTORRENT
 
 	  http://libtorrent.rakshasa.no/
 
-comment "rtorrent requires a toolchain with C++ and WCHAR support"
-	depends on !(BR2_INSTALL_LIBSTDCPP && BR2_USE_WCHAR)
+comment "rtorrent requires a toolchain with C++, threads and WCHAR support"
+	depends on !(BR2_INSTALL_LIBSTDCPP && BR2_USE_WCHAR && BR2_TOOLCHAIN_HAS_THREADS)