WIN32 specific Blacklisted libraries check:

1) Polished up wording of the error messages.
2) Made some messages in the SysInfo dialog localized.
3) Renamed LibraryCheck.cpp/hpp to BlacklistedLibraryCheck.cpp/hpp
4) CPPized the BlacklistedLibraryCheck WIN32 C code.

src/libslic3r/BlacklistedLibraryCheck.hpp

@@ -0,0 +1,46 @@
+#ifndef slic3r_BlacklistedLibraryCheck_hpp_
+#define slic3r_BlacklistedLibraryCheck_hpp_
+
+#ifdef  WIN32
+#include <windows.h>
+#include <vector>
+#include <string>
+#endif //WIN32
+
+namespace Slic3r {
+
+#ifdef  WIN32
+class BlacklistedLibraryCheck
+{
+public:
+    static BlacklistedLibraryCheck& get_instance()
+    {
+        static BlacklistedLibraryCheck instance; 
+                              
+        return instance;
+    }
+private:
+    BlacklistedLibraryCheck() = default;
+
+    std::vector<std::wstring> m_found;
+public:
+    BlacklistedLibraryCheck(BlacklistedLibraryCheck const&) = delete;
+    void operator=(BlacklistedLibraryCheck const&) = delete;
+    // returns all found blacklisted dlls
+    bool get_blacklisted(std::vector<std::wstring>& names);
+    std::wstring get_blacklisted_string();
+    // returns true if enumerating found blacklisted dll
+    bool perform_check();
+
+    // UTF-8 encoded path
+    static bool is_blacklisted(const std::string &dllpath);
+    static bool is_blacklisted(const std::wstring &dllpath);
+private:
+    static const std::vector<std::wstring> blacklist;
+};
+
+#endif //WIN32
+
+} // namespace Slic3r
+
+#endif //slic3r_BlacklistedLibraryCheck_hpp_