Relax OpenCascade version requirement #4510
Open
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Current approach is too strict and only allow to use 7.6.2 which is not shipped in many distros.
Due to reorganization of components in 7.8.0 release (https://dev.opencascade.org/doc/overview/html/occt__upgrade.html#upgrade_occt780) added conditional OCCT_LIBS configuration based on found OpenCascade version.
Fixes #3912