package/optee-*: packages depend on thread support

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 package optee-client and
updates dependent packages accordingly: optee-benchmark, optee-client,
optee-examples and optee-test.

Fixes [1] and [2] where config selected an toolchain without thread
support and build failed with trace like:

  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] http://autobuild.buildroot.net/results/ed6ffe2197da4f3a970bd3c5522291236396cc8e
[2] http://autobuild.buildroot.net/results/406f90048db097580b626ef889823132f8676ba1

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
[Thomas: fix dependencies of Config.in comment, as noticed by Baruch.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/optee-benchmark/Config.in

@@ -1,6 +1,7 @@
 config BR2_PACKAGE_OPTEE_BENCHMARK
 	bool "optee-benchmark"
 	depends on !BR2_STATIC_LIBS # optee-client
+	depends on BR2_TOOLCHAIN_HAS_THREADS # optee-client
 	select BR2_PACKAGE_OPTEE_CLIENT
 	select BR2_PACKAGE_LIBYAML
 	help
@@ -11,5 +12,5 @@ config BR2_PACKAGE_OPTEE_BENCHMARK
 
 	  http://github.com/linaro-swg/optee_benchmark
 
-comment "optee-benchmark needs a toolchain w/ dynamic library"
-	depends on BR2_STATIC_LIBS
+comment "optee-benchmark needs a toolchain w/ dynamic library and threads"
+	depends on BR2_STATIC_LIBS || !BR2_TOOLCHAIN_HAS_THREADS

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
@@ -13,5 +14,5 @@ config BR2_PACKAGE_OPTEE_CLIENT
 
 	  https://github.com/OP-TEE/optee_client
 
-comment "optee-client needs a toolchain w/ dynamic library"
-	depends on BR2_STATIC_LIBS
+comment "optee-client needs a toolchain w/ dynamic library and threads"
+	depends on BR2_STATIC_LIBS || !BR2_TOOLCHAIN_HAS_THREADS

package/optee-examples/Config.in

@@ -2,6 +2,7 @@ config BR2_PACKAGE_OPTEE_EXAMPLES
 	bool "optee-examples"
 	depends on BR2_TARGET_OPTEE_OS
 	depends on !BR2_STATIC_LIBS # optee-client
+	depends on BR2_TOOLCHAIN_HAS_THREADS # optee-client
 	select BR2_PACKAGE_OPTEE_CLIENT
 	select BR2_TARGET_OPTEE_OS_SDK
 	help
@@ -18,6 +19,6 @@ config BR2_PACKAGE_OPTEE_EXAMPLES
 
 	  https://github.com/linaro-swg/optee_examples
 
-comment "optee-examples needs a toolchain w/ dynamic library"
+comment "optee-examples needs a toolchain w/ dynamic library and threads"
 	depends on BR2_TARGET_OPTEE_OS
-	depends on BR2_STATIC_LIBS
+	depends on BR2_STATIC_LIBS || !BR2_TOOLCHAIN_HAS_THREADS

package/optee-test/Config.in

@@ -2,6 +2,7 @@ config BR2_PACKAGE_OPTEE_TEST
 	bool "optee-test"
 	depends on BR2_TARGET_OPTEE_OS
 	depends on !BR2_STATIC_LIBS # optee-client
+	depends on BR2_TOOLCHAIN_HAS_THREADS # optee-client
 	select BR2_PACKAGE_OPTEE_CLIENT
 	select BR2_TARGET_OPTEE_OS_SDK
 	help
@@ -22,6 +23,6 @@ config BR2_PACKAGE_OPTEE_TEST
 
 	  http://github.com/OP-TEE/optee_test
 
-comment "optee-test needs a toolchain w/ dynamic library"
+comment "optee-test needs a toolchain w/ dynamic library and threads"
 	depends on BR2_TARGET_OPTEE_OS
-	depends on BR2_STATIC_LIBS
+	depends on BR2_STATIC_LIBS || !BR2_TOOLCHAIN_HAS_THREADS