client almost builds

vendor/cryptopp/TestPrograms/test_pthreads.cpp

@@ -0,0 +1,15 @@
+#include <string>
+#include <pthread.h>
+
+void* function(void *ptr)
+{
+    return 0;
+}
+
+int main(int argc, char* argv[])
+{
+    pthread_t thread;
+    int ret = pthread_create(&thread, NULL, function, (void*)0);
+    pthread_join(thread, NULL);
+    return 0;
+}