Fix detection of platform specific reference files

The platform specific part of the reference file extension was misinterpreted if it contained only one field (platform, os, optimization, etc.).

This MR fixes the problem by allowing only one convention for the platform string.

Closes #236 (closed)

changed milestone to %v36r9

added lhcb-gaudi-head label

assigned to @clemenci

mentioned in issue #236 (closed)

• [2022-11-15 14:00] Automatic merge failed in [lhcb-gaudi-head#3399](https://lhcb-nightlies.web.cern.ch/nightly/lhcb-gaudi-head/3399/Gaudi/checkout
• [2022-11-16 00:03] Validation started with lhcb-gaudi-head#3400
• [2022-11-16 00:21] Validation started with lhcb-run2-gaudi-head#418

added 21 commits

• d60bffb8...5de4967d - 19 commits from branch gaudi:master
• 5c51de5d - Fix handling of old/new style platform syntax in ref files extensions
• 6b783640 - Drop support for ancient LHCb platform naming convention

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approved this merge request

merged

mentioned in commit 846c5df8