Fixed ignoring of LIBRARY_INDEX_URL system property #6494
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xardael
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LibraryInstaller uses only GZippedJsonDownloader,
https://github.com/arduino/Arduino/blob/master/arduino-core/src/cc/arduino/contributions/libraries/LibraryInstaller.java#L65
which should fall back to JsonDwnloader only if the downloading of gziped JSON fails. (In catch block)
https://github.com/arduino/Arduino/blob/master/arduino-core/src/cc/arduino/contributions/GZippedJsonDownloader.java#L54
But if I set LIBRARY_INDEX_URL system property, which is then stored into LIBRARY_INDEX_URL constant, it will be ignored since the LIBRARY_INDEX_URL_GZ takes precedence, and it is set to arduino.cc's librayr_index.json.
So I introduced the possibility to set system property for Gzipped JSON URL as well, and moreover when the LIBRARY_INDEX_URL system property is set and LIBRARY_INDEX_URL_GZ is not, it will get empty string value, and the try block in GZippedJson downloader will fail and JsonDownloader from the catch block will be called.