fix ccall test for not-found library output (#37220)

Author: JeffBezanson

test/ccall.jl

@@ -1554,15 +1554,15 @@ let
 end
 
 # issue #34061
-o_file = tempname()
-output = read(Cmd(`$(Base.julia_cmd()) --output-o=$o_file -e 'Base.reinit_stdio();
-    f() = ccall((:dne, :does_not_exist), Cvoid, ());
-    f()'`; ignorestatus=true), String)
-@test occursin(output, """
-ERROR: could not load library "does_not_exist"
-does_not_exist.so: cannot open shared object file: No such file or directory
-""")
-@test !isfile(o_file)
+let o_file = tempname(), err = Base.PipeEndpoint()
+    run(pipeline(Cmd(`$(Base.julia_cmd()) --output-o=$o_file -e 'Base.reinit_stdio();
+        f() = ccall((:dne, :does_not_exist), Cvoid, ());
+        f()'`; ignorestatus=true), stderr=err), wait=false)
+    output = read(err, String)
+    @test occursin("""ERROR: could not load library "does_not_exist"
+    """, output)
+    @test !isfile(o_file)
+end
 
 # pass NTuple{N,T} as Ptr{T}/Ref{T}
 let