Fixed deprecated and casting build errors caught on recent compilers

[filipecosta90]

• Fixes Error when building on MacOS arm64-apple-darwin21.6.0 #247
• I've set an old standard to make this work even for old compiler versions. Agree @YaacovHazan and @yossigo ?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (20c013d) 64.53% compared to head (b3568d8) 64.53%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #248   +/-   ##
=======================================
  Coverage   64.53%   64.53%           
=======================================
  Files          21       21           
  Lines        4368     4368           
=======================================
  Hits         2819     2819           
  Misses       1549     1549           

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[yossigo]

@filipecosta90 Did you consider fixing the issues themselves? I think it should be fairly simple and still backward compatible, so overall preferred over changing compiler flags.

[filipecosta90]

@filipecosta90 Did you consider fixing the issues themselves? I think it should be fairly simple and still backward compatible, so overall preferred over changing compiler flags.

Indeed. Addressed in the latest commit @yossigo