ARROW-3580: [Gandiva][C++] Fix build error with g++ 8.2.0

[kou]

Error message1:

In file included from /home/kou/work/cpp/arrow.kou/cpp/src/gandiva/expr_decomposer.cc:27:
/home/kou/work/cpp/arrow.kou/cpp/src/gandiva/function_holder_registry.h:46:27: error: 'function' in namespace 'std' does not name a template type
   using maker_type = std::function<Status(const FunctionNode&, FunctionHolderPtr*)>;
                           ^~~~~~~~
/home/kou/work/cpp/arrow.kou/cpp/src/gandiva/function_holder_registry.h:46:22: note: 'std::function' is defined in header '<functional>'; did you forget to '#include <functional>'?
/home/kou/work/cpp/arrow.kou/cpp/src/gandiva/function_holder_registry.h:30:1:
+#include <functional>

/home/kou/work/cpp/arrow.kou/cpp/src/gandiva/function_holder_registry.h:46:22:
   using maker_type = std::function<Status(const FunctionNode&, FunctionHolderPtr*)>;
                      ^~~
/home/kou/work/cpp/arrow.kou/cpp/src/gandiva/function_holder_registry.h:47:52: error: 'maker_type' was not declared in this scope
   using map_type = std::unordered_map<std::string, maker_type>;
                                                    ^~~~~~~~~~
/home/kou/work/cpp/arrow.kou/cpp/src/gandiva/function_holder_registry.h:47:52: note: suggested alternative: 'decltype'
   using map_type = std::unordered_map<std::string, maker_type>;
                                                    ^~~~~~~~~~
                                                    decltype
/home/kou/work/cpp/arrow.kou/cpp/src/gandiva/function_holder_registry.h:47:62: error: template argument 2 is invalid
   using map_type = std::unordered_map<std::string, maker_type>;
                                                              ^
/home/kou/work/cpp/arrow.kou/cpp/src/gandiva/function_holder_registry.h:47:62: error: template argument 5 is invalid
/home/kou/work/cpp/arrow.kou/cpp/src/gandiva/function_holder_registry.h:60:10: error: 'map_type' does not name a type; did you mean 'iswctype'?
   static map_type& makers() {
          ^~~~~~~~
          iswctype
/home/kou/work/cpp/arrow.kou/cpp/src/gandiva/function_holder_registry.h: In static member function 'static gandiva::Status gandiva::FunctionHolderRegistry::Make(const string&, const gandiva::FunctionNode&, gandiva::FunctionHolderPtr*)':
/home/kou/work/cpp/arrow.kou/cpp/src/gandiva/function_holder_registry.h:51:18: error: 'makers' was not declared in this scope
     auto found = makers().find(name);
                  ^~~~~~
/home/kou/work/cpp/arrow.kou/cpp/src/gandiva/function_holder_registry.h:51:18: note: suggested alternative: 'Make'
     auto found = makers().find(name);
                  ^~~~~~
                  Make

Message2:

/home/kou/work/cpp/arrow.kou/cpp/src/gandiva/tree_expr_builder.cc: In static member function 'static gandiva::NodePtr gandiva::TreeExprBuilder::MakeNull(gandiva::DataTypePtr)':
/home/kou/work/cpp/arrow.kou/cpp/src/gandiva/tree_expr_builder.cc:78:70: error: 'float_t' was not declared in this scope
       return std::make_shared<LiteralNode>(data_type, LiteralHolder((float_t)0), true);
                                                                      ^~~~~~~
/home/kou/work/cpp/arrow.kou/cpp/src/gandiva/tree_expr_builder.cc:78:70: note: suggested alternative: 'float'
       return std::make_shared<LiteralNode>(data_type, LiteralHolder((float_t)0), true);
                                                                      ^~~~~~~
                                                                      float
/home/kou/work/cpp/arrow.kou/cpp/src/gandiva/tree_expr_builder.cc:80:70: error: 'double_t' was not declared in this scope
       return std::make_shared<LiteralNode>(data_type, LiteralHolder((double_t)0), true);
                                                                      ^~~~~~~~
/home/kou/work/cpp/arrow.kou/cpp/src/gandiva/tree_expr_builder.cc:80:70: note: suggested alternative: 'double'
       return std::make_shared<LiteralNode>(data_type, LiteralHolder((double_t)0), true);
                                                                      ^~~~~~~~
                                                                      double

[xhochy]

+1, LGTM

Windows failure is unrelated to this patch set (zstd was build with the wrong flags).