L2TP: Fix detection of Libreswan 4.9 and later
Starting from Libreswan 4.9, a simplified version string is produced; e.g. "Libreswan 4.9". Update the detection code accordingly and do similar changes for strongSwan and Openswan detection for consistency. This detection code update is still compatible with earlier versions of Libreswan. (cherry picked from commit b1f34a86)
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