Fixes local file $ref resolution on windows

[casualjim]

No description provided.

[codecov]

Codecov Report

Merging #1001 into master will decrease coverage by <.01%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master    #1001      +/-   ##
==========================================
- Coverage    72.5%   72.49%   -0.01%     
==========================================
  Files          21       21              
  Lines        5979     5985       +6     
==========================================
+ Hits         4335     4339       +4     
  Misses       1187     1187              
- Partials      457      459       +2

Impacted Files	Coverage Δ
generator/support.go	68.68% <50%> (-0.26%)	⬇️
scan/schema.go	72.87% <50%> (-0.17%)	⬇️
generator/structs.go	41.33% <0%> (+2.66%)	⬆️

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