pdb: restore SIGINT handler in sigint_handler already

[blueyed]

BPO	36667
Nosy	@blueyed
PRs	bpo-36667: pdb: restore SIGINT handler in sigint_handler already #12880

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2019-04-19.11:07:53.500>
labels = ['type-bug', 'library', '3.9']
title = 'pdb: restore SIGINT handler in sigint_handler already'
updated_at = <Date 2019-04-19.11:08:26.078>
user = 'https://github.com/blueyed'

bugs.python.org fields:

activity = <Date 2019-04-19.11:08:26.078>
actor = 'blueyed'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2019-04-19.11:07:53.500>
creator = 'blueyed'
dependencies = []
files = []
hgrepos = []
issue_num = 36667
keywords = ['patch']
message_count = 1.0
messages = ['340539']
nosy_count = 1.0
nosy_names = ['blueyed']
pr_nums = ['12880']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue36667'
versions = ['Python 3.9']

[blueyed]

Without this, and additional SIGINT while waiting for the next statement
(e.g. during time.sleep) will stop at sigint_handler.

With this patch:

> …/t-pdb-sigint-in-sleep.py(10)<module>()
-> sleep()
(Pdb) c
^C
Program interrupted. (Use 'cont' to resume).
^CKeyboardInterrupt
> …/t-pdb-sigint-in-sleep.py(6)sleep()
-> time.sleep(10)
(Pdb)

Without this patch:

> …/t-pdb-sigint-in-sleep.py(10)<module>()
-> sleep()
(Pdb) c
^C
Program interrupted. (Use 'cont' to resume).
^C--Call--
> …/cpython/Lib/pdb.py(188)sigint_handler()
-> def sigint_handler(self, signum, frame):
(Pdb)

This was changed / regressed in 10e54ae (3.5.3rc1?), when it was moved while fixing bpo-20766.