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LCGConfig: Call lcg_setup_release only once

Frank Winklmeier requested to merge fwinkl/atlasexternals:lcg_config_speedup into master

Avoid calling lcg_setup_release if the LCG release has already been found successfully before. This saves about 1 second in configuration time (~15% for a single packet WorkDir).

I know, absolutely this is not a big saving but if we manage to find another seven of those, our cmake configuration is going to be "instant" for small WorkDirs ;-)

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