os.path: fix arg names (#3748)

tests/stubtest_whitelists/py3_common.txt

@@ -472,22 +472,8 @@ multiprocessing.synchronize.SemLock.acquire
 multiprocessing.synchronize.SemLock.release
 netrc.netrc.__init__
 nntplib._NNTPBase.starttls
-ntpath.basename
-ntpath.commonprefix
-ntpath.dirname
-ntpath.getatime
-ntpath.getctime
-ntpath.getmtime
-ntpath.getsize
-ntpath.isabs
-ntpath.isdir
-ntpath.normcase
+ntpath.join
 ntpath.realpath
-ntpath.samefile
-ntpath.samestat
-ntpath.split
-ntpath.splitdrive
-ntpath.splitext
 numbers.Number.__hash__
 operator.methodcaller
 optparse.HelpFormatter._format__Text
@@ -514,22 +500,6 @@ os.chflags
 os.lchflags
 os.lchmod
 os.listxattr
-os.path.basename
-os.path.commonprefix
-os.path.dirname
-os.path.getatime
-os.path.getctime
-os.path.getmtime
-os.path.getsize
-os.path.isabs
-os.path.isdir
-os.path.join
-os.path.normcase
-os.path.samefile
-os.path.samestat
-os.path.split
-os.path.splitdrive
-os.path.splitext
 os.plock
 os.sched_param._asdict
 os.sched_param._make
@@ -568,22 +538,6 @@ posix.uname_result._replace
 posix.waitid_result._asdict
 posix.waitid_result._make
 posix.waitid_result._replace
-posixpath.basename
-posixpath.commonprefix
-posixpath.dirname
-posixpath.getatime
-posixpath.getctime
-posixpath.getmtime
-posixpath.getsize
-posixpath.isabs
-posixpath.isdir
-posixpath.join
-posixpath.normcase
-posixpath.samefile
-posixpath.samestat
-posixpath.split
-posixpath.splitdrive
-posixpath.splitext
 pstats.Stats.__init__
 pwd.getpwnam
 pydoc.Doc.getdocloc