Tools: Checksum for gcc-arm download on arch prereqs #28547
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This will check to see if the tar.bz2 file exists and if it does it will run a checksum and skip redownloading the file if its already there. If the checksum fails or the file doesn't exist it will redownload the file.
I ran into issues with the download taking so long that my sudo permissions timed out and the install failed to complete. When rerunning the script it would redownload the file even if the file was already there. This change solves this issue.