Merge branch 'fix_include' into 'master'

fix include header

See merge request !715

mace/core/registry.h

@@ -15,6 +15,7 @@
 #ifndef MACE_CORE_REGISTRY_H_
 #define MACE_CORE_REGISTRY_H_
 
+#include <functional>
 #include <map>
 #include <memory>
 #include <mutex>  // NOLINT(build/c++11)

mace/kernels/proposal.h

@@ -16,6 +16,7 @@
 #define MACE_KERNELS_PROPOSAL_H_
 
 #include <algorithm>
+#include <cmath>
 #include <vector>
 
 #include "mace/core/future.h"