Download zlib from debian.org if zlib.net fails

[dgreatwood]

Download zlib from debian.org if zlib.net download fails

Also, use GitHub doxygen "latest" redirected URL to find doxygen version number when downloading doxygen

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.37%. Comparing base (cbdb91d) to head (60246b6).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1350   +/-   ##
=======================================
  Coverage   76.37%   76.37%           
=======================================
  Files          64       64           
  Lines        9977     9977           
=======================================
  Hits         7620     7620           
  Misses       2357     2357           

Flag	Coverage Δ
linux_debian_stable_gcc_address_false	77.69% <ø> (-0.02%)	⬇️
linux_debian_stable_gcc_address_true	78.02% <ø> (-0.02%)	⬇️
linux_debian_stable_gcc_none_false	77.86% <ø> (ø)
linux_debian_stable_gcc_none_true	78.16% <ø> (-0.02%)	⬇️
linux_debian_stable_gcc_undefined_false	77.82% <ø> (+0.01%)	⬆️
linux_debian_stable_gcc_undefined_true	78.15% <ø> (-0.07%)	⬇️
linuxflibev_debian_stable_gcc_address_false_false_true	75.53% <ø> (-0.02%)	⬇️
linuxflibev_debian_stable_gcc_address_false_true_true	75.34% <ø> (ø)
linuxflibev_debian_stable_gcc_address_true_false_true	76.04% <ø> (ø)
linuxflibev_debian_stable_gcc_address_true_true_true	75.97% <ø> (ø)
linuxflibev_debian_stable_gcc_none_false_false_true	75.69% <ø> (+0.29%)	⬆️
linuxflibev_debian_stable_gcc_none_false_true_true	75.56% <ø> (-0.04%)	⬇️
linuxflibev_debian_stable_gcc_none_true_false_true	76.12% <ø> (-0.05%)	⬇️
linuxflibev_debian_stable_gcc_none_true_true_true	75.93% <ø> (-0.03%)	⬇️
linuxflibev_debian_stable_gcc_undefined_false_false_true	75.48% <ø> (-0.02%)	⬇️
linuxflibev_debian_stable_gcc_undefined_false_true_true	75.55% <ø> (ø)
linuxflibev_debian_stable_gcc_undefined_true_false_true	76.02% <ø> (-0.15%)	⬇️
linuxflibev_debian_stable_gcc_undefined_true_true_true	75.95% <ø> (+0.04%)	⬆️

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