Fix processing of --platform-*-libs

[AlanGriffiths]

Fixes: #3088

[codecov]

Codecov Report

Merging #3090 (c539fb4) into main (9404475) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #3090      +/-   ##
==========================================
- Coverage   78.45%   78.44%   -0.01%     
==========================================
  Files        1064     1064              
  Lines       74434    74431       -3     
==========================================
- Hits        58394    58390       -4     
- Misses      16040    16041       +1     

Files	Coverage Δ
src/server/graphics/default_configuration.cpp	80.75% <100.00%> (-0.24%)	⬇️

... and 4 files with indirect coverage changes

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[Saviq]

Yups.

I was tempted to talk about ordering, but that would be papering over things we need to fix.