Fixed various warnings when compiling on macOS

[nmoinvaz]

No description provided.

[codecov]

Codecov Report

Merging #47 (cf5d6db) into master (0937bc9) will decrease coverage by 0.11%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #47      +/-   ##
==========================================
- Coverage   56.74%   56.63%   -0.11%     
==========================================
  Files          53       53              
  Lines        4601     4601              
  Branches     1060     1060              
==========================================
- Hits         2611     2606       -5     
- Misses       1306     1310       +4     
- Partials      684      685       +1     

Flag	Coverage Δ
macos	50.58% <0.00%> (ø)
ubuntu	53.33% <ø> (ø)
ubuntu_curl	52.99% <ø> (-0.04%)	⬇️
windows	56.36% <ø> (-0.20%)	⬇️

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Files Changed	Coverage Δ
resolver_mac.c	63.12% <0.00%> (ø)
wpad_dhcp_posix.c	66.66% <ø> (ø)

... and 1 file with indirect coverage changes

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