tempfile: various fixes (#3763)

* tempfile: add errors parameter in py38

* tempfile: add property to SpooledTemporaryFile

* tempfile: fix arg name

* tempfile: better document some of what's going on

* tempfile: update whitelists

tests/stubtest_whitelists/py38.txt

@@ -221,9 +221,6 @@ sys.setcheckinterval
 sys.setdlopenflags
 sys.setrecursionlimit
 sys.setswitchinterval
-tempfile.NamedTemporaryFile
-tempfile.SpooledTemporaryFile.__init__
-tempfile.TemporaryFile
 threading.ExceptHookArgs
 time.CLOCK_PROF
 time.CLOCK_UPTIME

tests/stubtest_whitelists/py3_common.txt

@@ -768,7 +768,6 @@ tempfile.SpooledTemporaryFile.__next__
 tempfile.SpooledTemporaryFile.readable
 tempfile.SpooledTemporaryFile.seekable
 tempfile.SpooledTemporaryFile.writable
-tempfile.SpooledTemporaryFile.writelines
 textwrap.TextWrapper.x
 textwrap.indent
 textwrap.wrap