On autobuilder config with BR2_TOOLCHAIN_HAS_THREADS not set the
following error happens when building the pthreadpool package:
```
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - not found
-- Check if compiler accepts -pthread
-- Check if compiler accepts -pthread - no
CMake Error at /home/buildroot/instance-0/output-1/host/share/cmake-3.31/Modules/FindPackageHandleStandardArgs.cmake:233 (message):
Could NOT find Threads (missing: Threads_FOUND)
Call Stack (most recent call first):
/home/buildroot/instance-0/output-1/host/share/cmake-3.31/Modules/FindPackageHandleStandardArgs.cmake:603 (_FPHSA_FAILURE_MESSAGE)
/home/buildroot/instance-0/output-1/host/share/cmake-3.31/Modules/FindThreads.cmake:226 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
CMakeLists.txt:143 (FIND_PACKAGE)
-- Configuring incomplete, errors occurred!
```
This can be reproduced with:
```
cat >.config <<EOF
BR2_armeb=y
BR2_TOOLCHAIN_BUILDROOT_UCLIBC=y
BR2_PTHREADS_NONE=y
BR2_PACKAGE_PTHREADPOOL=y
EOF
make olddefconfig
make pthreadpool
```
Since the introduction of this package in [1], the dependency was not
included. Since this package was part of the tensorflow-lite
dependencies that required thread it was not an issue.
This patch adds BR2_TOOLCHAIN_HAS_THREADS in the dependency to avoid
errors when built as a standalone package.
[1] f2486a6cf9 package/pthreadpool: new package
Fixes: https://autobuild.buildroot.org/results/35a/35aa100d72c6875350ad10c57f028f04052cbf79
Signed-off-by: Thomas Perale <thomas.perale@mind.be>
Signed-off-by: Romain Naour <romain.naour@smile.fr>
(cherry picked from commit 627af87bda)
Signed-off-by: Thomas Perale <thomas.perale@mind.be>
79a013c5ea