[Build] Touch the download files to change the modified time #10929
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Why I did it
It is to improve the build performance, when building multiple targets.
The modified time of downloaded files should be not older than the file .platform.
If not, the file will be downloaded again, when building any dependent targets.
How I did it
When downloading the packages from web site, the modified time will be changed by the command "touch".
How to verify it
Which release branch to backport (provide reason below if selected)
Description for the changelog
Link to config_db schema for YANG module changes
A picture of a cute animal (not mandatory but encouraged)