Remove global thread counter (again)

Seems fine without it now.

Utilities/Thread.cpp

@@ -1722,8 +1722,6 @@ DECLARE(thread_ctrl::g_native_core_layout) { native_core_arrangement::undefined
 
 void thread_base::start(native_entry entry)
 {
-	thread_ctrl::g_thread_count++;
-
 #ifdef _WIN32
 	m_thread = ::_beginthreadex(nullptr, 0, entry, this, CREATE_SUSPENDED, nullptr);
 	verify("thread_ctrl::start" HERE), m_thread, ::ResumeThread(reinterpret_cast<HANDLE>(+m_thread)) != -1;
@@ -1871,7 +1869,6 @@ void thread_base::finalize() noexcept
 {
 	g_tls_log_prefix = []() -> std::string { return {}; };
 	thread_ctrl::g_tls_this_thread = nullptr;
-	thread_ctrl::g_thread_count--;
 }
 
 void thread_ctrl::_wait_for(u64 usec, bool alert /* true */)