protobuf: needs thread support

Fix:
http://autobuild.buildroot.net/results/086/08661b6bd6796c9126bcbad3245323160b182ac8/

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/protobuf-c/Config.in

@@ -1,6 +1,7 @@
 config BR2_PACKAGE_PROTOBUF_C
 	bool "protobuf-c"
 	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_TOOLCHAIN_HAS_THREADS # protobuf
 	select BR2_PACKAGE_PROTOBUF
 	help
 	  Code generator and runtime libraries to use Protocol Buffers
@@ -8,5 +9,5 @@ config BR2_PACKAGE_PROTOBUF_C
 
 	  http://code.google.com/p/protobuf-c/
 
-comment "protobuf-c requires a toolchain with C++ support enabled"
-	depends on !BR2_INSTALL_LIBSTDCPP
+comment "protobuf-c requires a toolchain with C++ and thread support"
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS

package/protobuf/Config.in

@@ -1,11 +1,12 @@
 config BR2_PACKAGE_PROTOBUF
 	bool "protobuf"
 	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_TOOLCHAIN_HAS_THREADS
 	help
 	  Protocol buffers are Google's language-neutral, platform-neutral,
 	  extensible mechanism for serializing structured data.
 
 	  http://code.google.com/p/protobuf/
 
-comment "protobuf requires a toolchain with C++ support enabled"
-	depends on !BR2_INSTALL_LIBSTDCPP
+comment "protobuf requires a toolchain with C++ and thread support"
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS