fix: link against ucrt.lib to resolve missing symbols for malloc

[Wodann]

Temporary fix for Windows, as long as we are using malloc.

[codecov]

Codecov Report

Merging #82 into master will decrease coverage by 0.25%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master      #82      +/-   ##
==========================================
- Coverage   74.63%   74.37%   -0.26%     
==========================================
  Files         117      117              
  Lines        8893     8894       +1     
==========================================
- Hits         6637     6615      -22     
- Misses       2256     2279      +23

Impacted Files	Coverage Δ
crates/mun_codegen/src/code_gen/linker.rs	29.54% <0%> (-6.09%)	⬇️
crates/mun_target/src/spec/windows_msvc_base.rs	0% <0%> (-100%)	⬇️
...ates/mun_target/src/spec/x86_64_pc_windows_msvc.rs	0% <0%> (-100%)	⬇️

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[Wodann]

No longer necessary as PR #90 introduces runtime linked malloc.