Literal square brackets must be doubled in configure.ac
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This merge request is automatically copied from !1408 (merged) orginally made by @ellert
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Fixes failures from the nightlies:
checking for PYTHON... no
checking for PYTHON... no
File "<string>", line 1
import sys; print(".".join(sys.version.split(" ")0.split(".")[:2]))
^
SyntaxError: invalid syntax
checking for PYTHON... no
checking for PYTHON... no
File "<string>", line 1
import sys; print(".".join(sys.version.split(" ")0.split(".")[:2]))
^