bsdunzip_test: Set umask before asserting permissions

Fixes:		34b3da0013 ("unzip: Add symlink tests")

unzip/test/test_symlink.c

@@ -18,6 +18,7 @@ DEFINE_TEST(test_symlink)
 		return;
 	}
 
+	assertUmask(0);
 	extract_reference_file(reffile1);
 	extract_reference_file(reffile2);
 

unzip/test/test_symlink_dotdot.c

@@ -21,6 +21,7 @@ DEFINE_TEST(test_symlink_dotdot)
 		return;
 	}
 
+	assertUmask(0);
 	extract_reference_file(reffile);
 
 	r = systemf("%s %s >test.out 2>test.err", testprog, reffile);