Remove dependency on pathlib from makepkg.py

[narrieta]

My previous PR added a dependency on pathlib to allow the script to be used from any path, but this module is not available on the current automation, so undoing that change.

[codecov]

Codecov Report

Merging #2717 (bbf837e) into develop (3aebcdd) will decrease coverage by 0.01%.
The diff coverage is 80.84%.

@@             Coverage Diff             @@
##           develop    #2717      +/-   ##
===========================================
- Coverage    71.97%   71.96%   -0.02%     
===========================================
  Files          103      104       +1     
  Lines        15692    15765      +73     
  Branches      2486     2244     -242     
===========================================
+ Hits         11295    11345      +50     
- Misses        3881     3909      +28     
+ Partials       516      511       -5     

Impacted Files	Coverage Δ
azurelinuxagent/ga/collect_logs.py	81.15% <0.00%> (-0.36%)	⬇️
azurelinuxagent/common/osutil/factory.py	91.11% <33.33%> (-2.00%)	⬇️
azurelinuxagent/common/cgroupconfigurator.py	72.24% <40.00%> (-1.34%)	⬇️
azurelinuxagent/common/osutil/fedora.py	46.51% <46.51%> (ø)
azurelinuxagent/common/protocol/hostplugin.py	87.76% <75.00%> (+0.09%)	⬆️
azurelinuxagent/ga/exthandlers.py	86.06% <87.50%> (+0.37%)	⬆️
azurelinuxagent/common/protocol/goal_state.py	94.76% <91.66%> (-0.56%)	⬇️
azurelinuxagent/common/protocol/wire.py	78.24% <94.44%> (-0.30%)	⬇️
azurelinuxagent/ga/update.py	90.70% <96.66%> (+1.36%)	⬆️
azurelinuxagent/common/cgroupapi.py	81.00% <100.00%> (-2.80%)	⬇️
... and 15 more

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