Rollup merge of #140187 - amy-kwan:amy-kwan/update_runmake_tests_AIX, r=jieyouxu

[AIX] Handle AIX dynamic library extensions within c-link-to-rust-dylib run-make test

Dynamic libraries on AIX have the ".a" extension. The c-link-to-rust-dylib run-make test checks for the extension explicitly, so the extension for AIX is also added to accommodate the test case on AIX.

Author: matthiaskrgr