fix: Allow row encoding for 32-bit architectures (e.g. WASM)

[coastalwhite]

Fixes #17192.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 79.61%. Comparing base (36b1244) to head (b0eecbc).
Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/polars-row/src/row.rs	75.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #20186      +/-   ##
==========================================
- Coverage   79.63%   79.61%   -0.02%     
==========================================
  Files        1564     1564              
  Lines      217472   217707     +235     
  Branches     2474     2475       +1     
==========================================
+ Hits       173188   173333     +145     
- Misses      43715    43805      +90     
  Partials      569      569              

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[kgv]

checked, fixes my case, thx for PR.