[Buildroot] [PATCH] package/optee-client: depends on thread support

[Etienne Carriere]

BR2_PACKAGE_OPTEE_CLIENT depends on BR2_TOOLCHAIN_HAS_THREADS.
Library teec uses pthread support to protect clients state
management. This change declares this dependency in the package.

Fixes [1] that set an toolchain without thread support and failed
to build with trace:

  CMake Error at /home/buildroot/autobuild/run/instance-1/output/host/share/cmake-3.8/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
    Could NOT find Threads (missing: Threads_FOUND)
  Call Stack (most recent call first):
    /home/buildroot/autobuild/run/instance-1/output/host/share/cmake-3.8/Modules/FindPackageHandleStandardArgs.cmake:377 (_FPHSA_FAILURE_MESSAGE)
    /home/buildroot/autobuild/run/instance-1/output/host/share/cmake-3.8/Modules/FindThreads.cmake:212 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
    libteec/CMakeLists.txt:8 (find_package)

[1] https://autobuild.buildroot.net/results/ed6ffe2197da4f3a970bd3c5522291236396cc8e

Signed-off-by: Etienne Carriere <etienne.carriere at linaro.org>
---
 package/optee-client/Config.in | 1 +
 1 file changed, 1 insertion(+)

diff --git a/package/optee-client/Config.in b/package/optee-client/Config.in
index db0b7b7..1379201 100644
--- a/package/optee-client/Config.in
+++ b/package/optee-client/Config.in
@@ -1,6 +1,7 @@
 config BR2_PACKAGE_OPTEE_CLIENT
 	bool "optee-client"
 	depends on !BR2_STATIC_LIBS
+	depends on BR2_TOOLCHAIN_HAS_THREADS
 	help
 	  Enable the OP-TEE client package that brings non-secure
 	  client application resources for OP-TEE support. OP-TEE
-- 
1.9.1