tar: use filesystem-neutral replacement characters in the -s test

tar/test/test_option_s.c

@@ -46,9 +46,9 @@ DEFINE_TEST(test_option_s)
 	systemf("%s -xf test1_3.tar -C test1", testprog);
 	assertFileContents("foo", 3, "test1/in/d1/f##");
 	// For the 0-length pattern check, remember that "test1/" isn't part of the string affected by the regexp
-	systemf("%s -cf test1_4.tar -s /f*/\\<~\\>/g in/d1/foo", testprog);
+	systemf("%s -cf test1_4.tar -s /f*/[~]/g in/d1/foo", testprog);
 	systemf("%s -xf test1_4.tar -C test1", testprog);
-	assertFileContents("foo", 3, "test1/<>i<>n<>/<>d<>1<>/<f><>o<>o<>");
+	assertFileContents("foo", 3, "test1/[]i[]n[]/[]d[]1[]/[f][]o[]o[]");
 	/*
 	 * Test 2: Basic substitution when extracting archive.
 	 */