Apply Abseil patch to fix compile on Alpine Linux

[paleolimbot]

Closes #251.

Tested via:

# docker run --rm -it -v $(pwd):/s2 alpine:3.19.0
apk add R R-dev g++ linux-headers
R -e "install.packages(c('Rcpp', 'wk'), repos = 'https://cloud.r-project.org/')"
cd /s2 && R CMD INSTALL . --preclean

Upstream reference: abseil/abseil-cpp@4500c2f

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1f5e492) 93.98% compared to head (5c7c581) 93.98%.

❗ Current head 5c7c581 differs from pull request most recent head c73cd5e. Consider uploading reports for the commit c73cd5e to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #252   +/-   ##
=======================================
  Coverage   93.98%   93.98%           
=======================================
  Files          46       46           
  Lines        3522     3522           
=======================================
  Hits         3310     3310           
  Misses        212      212           

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