Fix LLVM clang compile warnings on Windows

[sergio-nsk]

No description provided.

[codecov]

Codecov Report

Merging #49 (4b3aa76) into master (e3b3217) will decrease coverage by 0.11%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #49      +/-   ##
==========================================
- Coverage   56.61%   56.51%   -0.11%     
==========================================
  Files          53       53              
  Lines        4608     4608              
  Branches     1063     1063              
==========================================
- Hits         2609     2604       -5     
- Misses       1310     1314       +4     
- Partials      689      690       +1     

Flag	Coverage Δ
macos	50.35% <0.00%> (ø)
ubuntu	53.33% <0.00%> (ø)
ubuntu_curl	53.02% <0.00%> (ø)
windows	56.36% <0.00%> (-0.20%)	⬇️

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Files Changed	Coverage Δ
fetch_posix.c	62.50% <0.00%> (ø)
net_adapter_winxp.c	73.33% <0.00%> (ø)
wpad_dhcp_posix.c	66.66% <0.00%> (ø)

... and 1 file with indirect coverage changes

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