ci: fix "Basic CI / cargo check (windows-latest)"

[cakebaker]

This PR fixes two issues that break the "Basic CI / cargo check (windows-latest)" check:

• an "unresolved import uucore::utmpx" error in w
• a "cannot find function parse_meminfo in this scope" error in free

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 45.42%. Comparing base (2505564) to head (00e7190).

Files	Patch %	Lines
src/uu/free/src/free.rs	40.00%	3 Missing ⚠️
src/uu/w/src/w.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #44      +/-   ##
==========================================
+ Coverage   44.95%   45.42%   +0.47%     
==========================================
  Files          15       15              
  Lines        1733     1803      +70     
  Branches      230      240      +10     
==========================================
+ Hits          779      819      +40     
- Misses        828      854      +26     
- Partials      126      130       +4     

Flag	Coverage Δ
macos_latest	44.28% <0.00%> (?)
ubuntu_latest	45.29% <100.00%> (+0.34%)	⬆️
windows_latest	0.13% <0.00%> (?)

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