Remove NEWS entries for packaging test suite fixes.

I haven’t updated NEWS for every change or fix in packaging, thinking
that the only entry we need for 3.3a1 is “Add packaging module to the
stdlib”.  Other developers have however added entries for these fixes,
but I don’t think they are interesting for users.

Note that the distutils2 backport has a full changelog.

Misc/NEWS

@@ -953,13 +953,9 @@ Library
 - Issue #12049: Add RAND_bytes() and RAND_pseudo_bytes() functions to the ssl
   module.
 
-- Issue #12125: fixed the failures under Solaris due to improper test cleanup.
-
 - Issue #6501: os.device_encoding() returns None on Windows if the application
   has no console.
 
-- Issue #12132: Skip test_build_ext in case the xxmodule is not found.
-
 - Issue #12105: Add O_CLOEXEC to the os module.
 
 - Issue #12079: Decimal('Infinity').fma(Decimal('0'), (3.91224318126786e+19+0j))
@@ -1685,12 +1681,6 @@ Tests
 - Issue #12057: Add tests for ISO 2022 codecs (iso2022_jp, iso2022_jp_2,
   iso2022_kr).
 
-- Issue #12180: Fixed a few remaining errors in test_packaging when no
-  threading.
-
-- Issue #12120, #12119: skip a test in packaging and distutils
-  if sys.dont_write_bytecode is set to True.
-
 - Issue #12096: Fix a race condition in test_threading.test_waitfor(). Patch
   written by Charles-François Natali.