Fix compilation for 32-bit targets

[LunarEclipse363]

This change makes the code compile for 32-bit targets (in my case armv7-unknown-linux-musleabihf, targeting a 2012 kindle non-touch e-book reader).

The failure without it is that some of the string literals exceed the size limit of a u32.

[codecov[bot]]

Codecov Report

:x: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review. :white_check_mark: Project coverage is 86.25%. Comparing base (83f6d2d) to head (ced30b0).

Files with missing lines	Patch %	Lines
src/cmp.rs	88.88%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #146      +/-   ##
==========================================
- Coverage   86.30%   86.25%   -0.05%     
==========================================
  Files          13       13              
  Lines        6227     6206      -21     
  Branches      511      514       +3     
==========================================
- Hits         5374     5353      -21     
  Misses        852      852              
  Partials        1        1              

Flag	Coverage Δ
macos_latest	86.20% <88.88%> (-0.05%)	:arrow_down:
ubuntu_latest	86.32% <88.88%> (-0.05%)	:arrow_down:
windows_latest	19.89% <0.00%> (-0.08%)	:arrow_down:

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