build/mongodl.py: Extract version of RHEL via .* (#1110)

During 'cmake --build .' file linked by /etc/os-release
is used to obtain operating system's type and its version number.
Version is extracted in _infer_target_os_rel() from VERSION_ID field by
regular expression r'VERSION_ID=("?)(.*?)\1'. Version is extracted as
a second group of the regular expression. This pattern is correct for
Debian-based operating systems, where value for this field is followed
and ended with quotation marks, e.g. VERSION_ID="20.02". On RHEL-based
distributions there are no quotation marks, e.g. VERSION_ID=36. Without
quotation marks, ("?) and \1 are matched to null string; lazy operator
is not forced to match anything, thus it is also matched to null string.
This results in extraction of version number as a null string. In
DISTRO_VERSION_MAP there is no entry for null string in any present
dictionary, thus RuntimeError is thrown. Tested on Fedora 32, 34 and 36.

Change from lazy (.*?) to greedy (.*) operator to extract correct
version of RHEL- and Debian-based distributions.

Signed-off-by: Michał Grzelak <mig@semihalf.com>