configure should pick /usr/bin/g++ automatically if present

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-08-13.07:31:29.458>
labels = ['build', '3.9']
title = 'configure should pick /usr/bin/g++ automatically if present'
updated_at = <Date 2021-08-13.07:31:29.458>
user = 'https://bugs.python.org/pmenzel'

bugs.python.org fields:

activity = <Date 2021-08-13.07:31:29.458>
actor = 'pmenzel'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Build']
creation = <Date 2021-08-13.07:31:29.458>
creator = 'pmenzel'
dependencies = []
files = []
hgrepos = []
issue_num = 44909
keywords = []
message_count = 1.0
messages = ['399497']
nosy_count = 3.0
nosy_names = ['krichter', 'iritkatriel', 'pmenzel']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue44909'
versions = ['Python 3.9']