Fix fenv_t initializer - #308

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 39.03%. Comparing base (c1e8462) to head (6404565).
Report is 9 commits behind head on master.

@@           Coverage Diff           @@
##           master     #308   +/-   ##
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  Coverage   39.02%   39.03%           
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  Files         233      233           
  Lines        6144     6151    +7     
  Branches     1608     1608           
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+ Hits         2398     2401    +3     
- Misses       3393     3397    +4     
  Partials      353      353           

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It seems that the definition of fenv_t in this repo is not a struct except on x86 (both 32 and 64bit). However, the system one does seem to be a struct. Which one is intended to be used?

(The include guard is such that if one version of fenv is included, the other one won't, at least on Linux)

Thanks for you comment. I didn't notice there are some openlibm_fenv_ARCH.h in the repo before. It is strange that fenv.c of some architectures like arm, amd64 and aarch64 includes openlibm_fenv.h, which uses project's fenv.h, but others like loongarch64 and riscv64 directly includes system's fenv.h

Maybe I should update my PR, to change these two architectures to use openlibm_fenv.h or just revert my changes to other architectures? or should I fix this inconsistence issue?

Maybe this version is ok