internal/rosa/make: split build and check

Doing these together breaks far too many buggy makefiles.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/python.go

@@ -48,12 +48,7 @@ func (t Toolchain) newPython() pkg.Artifact {
 			"LDFLAGS=-Wl,--dynamic-linker=/system/lib/" +
 				"ld-musl-" + linuxArch() + ".so.1",
 		},
-
-		ScriptEarly: `
-export HOME="$(mktemp -d)"
-`,
-
-		CheckName: "test",
+		Check: []string{"test"},
 	},
 		t.Load(Zlib),
 		t.Load(Libffi),