Merge branch 'make-futex-32bit' into 'master'

[SpuriousFutexSemaphore] futex are 32 bits on all platforms

See merge request !300

emper/lib/sync/SpuriousFutexSemaphore.hpp

@@ -20,7 +20,7 @@ namespace emper::lib::sync {
 // by only using a single atomic operation and a possible system call per method.
 class SpuriousFutexSemaphore {
  public:
-	using CounterType = long;
+	using CounterType = int32_t;
 
  private:
 	// >= 0 means no waiters