Fix outdated FSF mailing address in COPYING
Use the latest LGPL-2.0 license text from https://www.gnu.org/licenses/old-licenses/lgpl-2.0.txt, which has an updated mailing address and some insignificant whitespace changes.
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Use the latest LGPL-2.0 license text from https://www.gnu.org/licenses/old-licenses/lgpl-2.0.txt, which has an updated mailing address and some insignificant whitespace changes.