Don't add libtool to libtool

[isuruf]

Fixes #1222

[codecov]

Codecov Report

Merging #1237 into master will increase coverage by 0.09%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master    #1237      +/-   ##
==========================================
+ Coverage   60.10%   60.20%   +0.09%     
==========================================
  Files          58       58              
  Lines        5875     5877       +2     
==========================================
+ Hits         3531     3538       +7     
+ Misses       2344     2339       -5     

Impacted Files	Coverage Δ
conda_forge_tick/migrators/cross_compile.py	89.26% <50.00%> (-0.54%)	⬇️
conda_forge_tick/audit.py	28.90% <0.00%> (+2.89%)	⬆️
tests/test_audit.py	100.00% <0.00%> (+4.54%)	⬆️

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