SVG backend fails with encoding issue when running benchmark

[rahulporuri]

I see the following error when I run the enable gcbenchmark on windows with the pyqt5 backend. This is a release blocker for the upcoming 5.1.0 release (ref #719 )

Benchmarking backend: svg
        Benchmark draw_image
        Benchmark draw_marker_at_points ... Failed
        Benchmark draw_path
        Benchmark draw_path_at_points ... Failed
        Benchmark draw_path_linear_gradient
        Benchmark draw_rect
        Benchmark show_textTraceback (most recent call last):
  File "C:\Users\rporuri\.edm\envs\enable-test-3.6-pyqt5\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "C:\Users\rporuri\.edm\envs\enable-test-3.6-pyqt5\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Users\rporuri\.edm\envs\enable-test-3.6-pyqt5\lib\site-packages\enable\gcbench\__main__.py", line 38, in <module>
    main()
  File "C:\Users\rporuri\.edm\envs\enable-test-3.6-pyqt5\lib\site-packages\enable\gcbench\__main__.py", line 32, in main
    results = benchmark(outdir=outdir)
  File "C:\Users\rporuri\.edm\envs\enable-test-3.6-pyqt5\lib\site-packages\enable\gcbench\bench.py", line 63, in benchmark
    suite, name, module, extension=name, outdir=outdir
  File "C:\Users\rporuri\.edm\envs\enable-test-3.6-pyqt5\lib\site-packages\enable\gcbench\bench.py", line 147, in exercise_backend
    gc.save(fname)
  File "C:\Users\rporuri\.edm\envs\enable-test-3.6-pyqt5\lib\site-packages\kiva\svg.py", line 180, in save
    f.write(template % locals())
  File "C:\Users\rporuri\.edm\envs\enable-test-3.6-pyqt5\lib\encodings\cp1252.py", line 19, in encode
    return codecs.charmap_encode(input,self.errors,encoding_table)[0]
UnicodeEncodeError: 'charmap' codec can't encode characters in position 1292-1295: character maps to <undefined>