set DLL directory when loading DLLs on Windows systems (bug #48511) * file-ops.h (file_ops::dirname): New function. * oct-shlib.cc (set_dll_directory): New function. (octave_w32_shlib::octave_w32_shlib): Call file_ops::dirname to get directory part of shared library file, then use set_dll_directory to temporarily alter DLL search path. * ov-java.cc (set_dll_directory): Delete. (initialize_jvm): Don't set DLL search path for Windows systems here. That job is now handled by octave::dynamic_library.

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