Compile with fast_float by default

[zuiderkwast]

Changes the Makefile to compile with USE_FAST_FLOAT=yes by default.

When fast_float was added in a minor version, we didn't want to compile with it by default, but we can change that in the upcoming major version 9.0.

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 71.57%. Comparing base (fd8270a) to head (e3d8ae3). :warning: Report is 5 commits behind head on unstable.

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #2448      +/-   ##
============================================
+ Coverage     71.54%   71.57%   +0.03%     
============================================
  Files           125      125              
  Lines         69214    69215       +1     
============================================
+ Hits          49522    49544      +22     
+ Misses        19692    19671      -21     

see 13 files with indirect coverage changes

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[zuiderkwast]

:sleepy: I forgot that I already tried this before in #2295 and it needs some changes to some environments.....

[madolson]

@roshkhatri Do we compile this by default for the container?

[roshkhatri]

Yes we do compile containers with fast float by default.