fix regex for extracting glibc version from output of 'ldd --version
' in Gentoo Linux
#4290
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Without this change, we get
UNKNOWN
in a Gentoo Linux environment:That causes trouble with Qt5 for example, because
get_glibc_version
is used in the sanity check, which leads to:(cfr. EESSI/software-layer#284)
With this change, the glibc version is detected correctly also in Gentoo: