System.normalize_path() fails on UTF-8 path.
Imported from https://youtrack.roxen.com/issue/PIKE-103
Reported by @grubba
Path normalization failure for "testdir0/test_x_put_copy_move_delete/åÅäÄöÖæÆüÜñÑ@":
normalize_path: File not found.
-:1: System.normalize_path("C:/disttest/install test/ws_6_2/var/testsuite/webdav/testdir0/test_x_put_copy_move_delete/Ã¥Ã\205äÃ\204öÃ\226æÃ\206üÃ\234ñÃ\221@")
C:/disttest/install test/ws_6_2/server-6.2.128/modules/filesystems/filesystem.pike (b7348cf2):56: RoxenModule(Test server 1/filesystem1. 1)->normalize_path("C:/disttest/install test/ws_6_2/var/testsuite/webdav/testdir0/test_x_put_copy_move_delete/Ã¥Ã\205äÃ\204öÃ\226æÃ\206üÃ\234ñÃ\221@")
C:/disttest/install test/ws_6_2/server-6.2.128/modules/filesystems/filesystem.pike (b7348cf2):538: RoxenModule(Test server 1/filesystem1. 1)->low_real_path("testdir0/test_x_put_copy_move_delete/åÅäÄöÖæÆüÜñÑ@",RequestID(/webdav/testdir0/test_x_put_copy_move_delete/))
C:/disttest/install test/ws_6_2/server-6.2.128/modules/filesystems/filesystem.pike (b7348cf2):573: RoxenModule(Test server 1/filesystem1. 1)->real_path("testdir0/test_x_put_copy_move_delete/åÅäÄöÖæÆüÜñÑ@",@0=RequestID(/webdav/testdir0/test_x_put_copy_move_delete/))
C:/disttest/install test/ws_6_2/server-6.2.128/modules/filesystems/filesystem.pike (b7348cf2):448: RoxenModule(Test server 1/filesystem1. 1)->stat_file("testdir0/test_x_put_copy_move_delete/åÅäÄöÖæÆüÜñÑ@",@0)
/disttest/install test/ws_6_2/server-6.2.128/base_server/module.pike (85b3b74c):587: RoxenModule(Test server 1/filesystem1. 1)->query_property_set("testdir0/test_x_put_copy_move_delete/åÅäÄöÖæÆüÜñÑ@",@0)
/disttest/install test/ws_6_2/server-6.2.128/base_server/module.pike (85b3b74c):642: RoxenModule(Test server 1/filesystem1. 1)->recurse("testdir0/test_x_put_copy_move_delete/åÅäÄöÖæÆüÜñÑ@",2147483646)
/disttest/install test/ws_6_2/server-6.2.128/base_server/module.pike (85b3b74c):667: RoxenModule(Test server 1/filesystem1. 1)->recurse("testdir0/test_x_put_copy_move_delete/",2147483646)
/disttest/install test/ws_6_2/server-6.2.128/base_server/module.pike (85b3b74c):677: RoxenModule(Test server 1/filesystem1. 1)->recurse_find_properties("testdir0/test_x_put_copy_move_delete/","DAV:propname",2147483647,@0,UNDEFINED)
C:/disttest/install test/ws_6_2/server-6.2.128/modules/misc/webdav.pike (eda515f2):713: RoxenModule(Test server 1/webdav1. 0)->__lambda_67143_2_line_711("testdir0/test_x_put_copy_move_delete/","/webdav/",2147483647,RoxenModule(Test server 1/filesystem1. 1),@0)
C:/disttest/install test/ws_6_2/server-6.2.128/modules/misc/webdav.pike (eda515f2):877: RoxenModule(Test server 1/webdav1. 0)->handle_webdav(@0)
C:/disttest/install test/ws_6_2/server-6.2.128/modules/misc/webdav.pike (eda515f2):186: RoxenModule(Test server 1/webdav1. 0)->first_try(@0)
/disttest/install test/ws_6_2/server-6.2.128/base_server/configuration.pike (01144b2c):2726: Configuration(Test server 1)->handle_request(@0,UNDEFINED)
/disttest/install test/ws_6_2/server-6.2.128/protocols/http.pike (74651ff3):3247: RequestID(/webdav/testdir0/test_x_put_copy_move_delete/)->handle_request()
/disttest/install test/ws_6_2/server-6.2.128/protocols/http.pike (74651ff3):3178: RequestID(/webdav/testdir0/test_x_put_copy_move_delete/)->handle_request_from_queue()
/disttest/install test/ws_6_2/server-6.2.128/base_server/roxen.pike (3e153f19):734: roxen()->handler_thread(13)