configure checks fail confusingly under --with-address-sanitizer if libasan is missing

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2017-08-14.08:01:57.293>
labels = ['build']
title = 'configure checks fail confusingly under --with-address-sanitizer if libasan is missing'
updated_at = <Date 2019-03-19.12:31:17.603>
user = 'https://github.com/pmatos'

bugs.python.org fields:

activity = <Date 2019-03-19.12:31:17.603>
actor = 'matrixise'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Build']
creation = <Date 2017-08-14.08:01:57.293>
creator = 'pmatos'
dependencies = []
files = []
hgrepos = []
issue_num = 31199
keywords = ['patch']
message_count = 3.0
messages = ['300238', '300239', '338347']
nosy_count = 3.0
nosy_names = ['twouters', 'matrixise', 'pmatos']
pr_nums = ['12433']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue31199'
versions = []