Reactivate Windows (x86_64, msvc) target

[nbigaouette]

Reactivate Windows target (x86_64, msvc)

[codecov-io]

Codecov Report

Merging #55 (4082eb2) into master (0cadee1) will increase coverage by 0.41%.
The diff coverage is 8.33%.

@@            Coverage Diff             @@
##           master      #55      +/-   ##
==========================================
+ Coverage   14.13%   14.55%   +0.41%     
==========================================
  Files          18       18              
  Lines         962      962              
==========================================
+ Hits          136      140       +4     
+ Misses        826      822       -4     

Impacted Files	Coverage Δ
onnxruntime/src/environment.rs	89.83% <0.00%> (ø)
onnxruntime/src/error.rs	57.14% <ø> (ø)
onnxruntime/src/session.rs	0.00% <0.00%> (ø)
onnxruntime/src/lib.rs	37.34% <100.00%> (+4.81%)	⬆️

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