Remove unused mutexes from DepTree::thread_params.

include/deptree.h

@@ -22,8 +22,6 @@ class DepTree
   LeafVector leafs;
   pthread_mutex_t leaf_mtx;
   pthread_mutex_t root_mtx;
-  pthread_mutex_t vars_mtx;
-  pthread_mutex_t prsv_mtx;
   pthread_mutex_t tree_mtx;
  } thread_params;
  NodeVector parents;

src/deptree.cpp

@@ -500,8 +500,6 @@ int DepTree::EvaluateTree(unsigned int nthreads)
   p.root=this;
   pthread_mutex_init(&p.leaf_mtx,nullptr);
   pthread_mutex_init(&p.root_mtx,nullptr);
-  pthread_mutex_init(&p.vars_mtx,nullptr);
-  pthread_mutex_init(&p.prsv_mtx,nullptr);
   pthread_mutex_init(&p.tree_mtx,nullptr);
   while(0!=p.root->parents.size()) p.root=*(p.root->parents.begin());
 
@@ -511,8 +509,6 @@ int DepTree::EvaluateTree(unsigned int nthreads)
   delete[] threads;
   pthread_mutex_destroy(&p.leaf_mtx);
   pthread_mutex_destroy(&p.root_mtx);
-  pthread_mutex_destroy(&p.vars_mtx);
-  pthread_mutex_destroy(&p.prsv_mtx);
   pthread_mutex_destroy(&p.tree_mtx);
  }
  return p.exitcode;