Rollup merge of rust-lang#127953 - bzEq:aix-compiletest-dylib-suffix, r=jieyouxu

[compiletest] Search *.a when getting dynamic libraries on AIX

AIX uses `.a` as dylib suffix. Support it in compiletest.

Author: tgross35

src/tools/compiletest/src/runtest.rs

@@ -94,6 +94,8 @@ fn get_lib_name(lib: &str, aux_type: AuxType) -> Option<String> {
             format!("{}.dll", lib)
         } else if cfg!(target_vendor = "apple") {
             format!("lib{}.dylib", lib)
+        } else if cfg!(target_os = "aix") {
+            format!("lib{}.a", lib)
         } else {
             format!("lib{}.so", lib)
         }),