[issue45743] Cleanup and simplify setup.py

[Christian Heimes]

Christian Heimes <lists at cheimes.de> added the comment:

For reference: https://opensource.apple.com/source/ld64/ld64-242/doc/man/man1/ld.1.auto.html

> search_paths_first
> This is now the default (in Xcode4 tools).  When processing -lx the linker now searches each directory
> in its library search paths for `libx.dylib' then `libx.a' before the moving on to the next path
> in the library search path.

According to Wikipedia, Xcode4 was released in 2011.

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