Fixes for enums in TactilityC (#404)

TactilityC/Include/tt_lock.h

@@ -10,17 +10,17 @@ extern "C" {
 /** A handle that represents a lock instance. A lock could be a Mutex or similar construct */
 typedef void* LockHandle;
 
-enum TtMutexType {
+typedef enum {
     MutexTypeNormal,
     MutexTypeRecursive
-};
+} TtMutexType;
 
 /**
  * Allocate a new mutex instance
  * @param[in] type specify if the mutex is either a normal one, or whether it can recursively (re)lock
  * @return the allocated lock handle
  */
-LockHandle tt_lock_alloc_mutex(enum TtMutexType type);
+LockHandle tt_lock_alloc_mutex(TtMutexType type);
 
 /**
  * Allocate a lock for a file or folder.