Only calculate the mapping of version suffixes if they are actually used #3326
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Otherwise, at our site, when using multiple paths in
EASYBUILD_ROBOT_PATHS, this fails withERROR: No unique versionsuffix mapping for -Python-2.7.10 in {'name': 'GCC', 'version': '7.3.0'} toolchain hierarchy to {'name': 'GCC', 'version': '9.3.0'} toolchain hierarchyWhile this may or may not be a bug in the easyconfigs we have in our robot_paths (we may have duplicated -Python version suffixes for example), we don't usually use versionsuffixes, and for the easyconfig I was trying to build, there are absolutely no need to have
versionsuffixmapped, since none is used.