os_type windows program_suffix .exe obj_suffix obj static_suffix lib soname_pattern_base "botan.dll" install_root c:\\Botan doc_dir docs install_cmd_data "copy" install_cmd_exec "copy" cryptgenrandom gmtime_s loadlibrary mkgmtime query_perf_counter virtual_lock rtlsecurezeromemory stl_filesystem_msvc threads filesystem win32 MSWin32