Mark problematic tests as broken on Alpine Linux

Fixes #26761.

test/cmdlineargs.jl

@@ -502,7 +502,11 @@ for precomp in ("yes", "no")
     succ, out, bt = readchomperrors(`$(Base.julia_cmd()) --startup-file=no --sysimage-native-code=$precomp -E 'include("____nonexistent_file")'`)
     @test !succ
     @test out == ""
-    @test occursin("include_relative(::Module, ::String) at $(joinpath(".", "loading.jl"))", bt)
+    if Sys.islinux() && !Sys.isglibc() && precomp == "yes"
+        @test_broken occursin("include_relative(::Module, ::String) at $(joinpath(".", "loading.jl"))", bt)
+    else
+        @test occursin("include_relative(::Module, ::String) at $(joinpath(".", "loading.jl"))", bt)
+    end
     lno = match(r"at \.[\/\\]loading\.jl:(\d+)", bt)
     @test length(lno.captures) == 1
     @test parse(Int, lno.captures[1]) > 0

test/precompile.jl

@@ -276,12 +276,15 @@ try
           end
           """)
 
-    @test_warn "ERROR: LoadError: Declaring __precompile__(false) is not allowed in files that are being precompiled.\nStacktrace:\n [1] __precompile__" try
-        Base.compilecache(Base.PkgId("Baz")) # from __precompile__(false)
-        error("__precompile__ disabled test failed")
-    catch exc
-        isa(exc, ErrorException) || rethrow(exc)
-        occursin("__precompile__(false)", exc.msg) && rethrow(exc)
+    # This test is broken on Alpine Linux
+    if !Sys.islinux() || (Sys.islinux() && Sys.isglibc())
+        @test_warn "ERROR: LoadError: Declaring __precompile__(false) is not allowed in files that are being precompiled.\nStacktrace:\n [1] __precompile__" try
+            Base.compilecache(Base.PkgId("Baz")) # from __precompile__(false)
+            error("__precompile__ disabled test failed")
+        catch exc
+            isa(exc, ErrorException) || rethrow(exc)
+            occursin("__precompile__(false)", exc.msg) && rethrow(exc)
+        end
     end
 
     # Issue #12720