Fixed leak in sys.flags initialization.
Issue #16404: Add checks for return value of PyLong_FromLong() in
sys.getwindowsversion() and ossaudiodev.setparameters().
Reported by Ned Batchelder.
Issue #20007: HTTPResponse.read(0) no more prematurely closes connection.
Original patch by Simon Sapin.
Revert misled test change in f189da5bda26.
Issue #20006: Fix sporadic failures in test_weakset.
#19855: uuid.get_node now looks on the PATH for executables on unix.

Patch by Serhiy Storchaka.