ENH: GUI: add arm64 check logic for windows

jira: no-jira
Change-Id: Ic788d4ae9218b909eae5ce571d4436c39e77230a
(cherry picked from commit 323184e42c5f85c8738b03b890e5aaf3818e8858)

src/slic3r/Utils/Http.hpp

@@ -90,6 +90,7 @@ public:
 
 	//BBS set global header for each http request
 	static void set_extra_headers(std::map<std::string, std::string> headers);
+	static std::map<std::string, std::string> get_extra_headers();
 
 	~Http();