Revert "Skip two more tests which are fixed by a pending Emscripten PR"

This reverts commit a8bbec5.

Author: hoodmane

Lib/test/test_io.py

@@ -3933,7 +3933,6 @@ def test_issue35928(self):
         self.assertEqual(res + f.readline(), 'foo\nbar\n')
 
     @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
-    @unittest.skipIf(support.is_emscripten, "Would be fixed by emscripten-core/emscripten#23058")
     def test_read_non_blocking(self):
         import os
         r, w = os.pipe()

Lib/test/test_zipfile/test_core.py

@@ -22,8 +22,7 @@
 from test.support import script_helper
 from test.support import (
     findfile, requires_zlib, requires_bz2, requires_lzma,
-    captured_stdout, captured_stderr, requires_subprocess,
-    is_emscripten
+    captured_stdout, captured_stderr, requires_subprocess
 )
 from test.support.os_helper import (
     TESTFN, unlink, rmtree, temp_dir, temp_cwd, fd_count, FakePath
@@ -623,7 +622,6 @@ def test_write_to_readonly(self):
             with self.assertRaises(ValueError):
                 zipfp.open(TESTFN, mode='w')
 
-    @unittest.skipIf(support.is_emscripten, "Would be fixed by emscripten-core/emscripten#23058")
     def test_add_file_before_1980(self):
         # Set atime and mtime to 1970-01-01
         os.utime(TESTFN, (0, 0))