[FS#675] Packages and Packages.gz have different content, cause opkg update fail when configured with src/gz

[LEDE Bugs]

The following task has a new comment added:

FS#675 - Packages and Packages.gz have different content, cause opkg update fail when configured with src/gz
User who did this - jwfang (jwfang)

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downloading of Packages.gz by curl cause redirect, add -L produce the same wrong
file as wget:

root at LEDE:/tmp/c# curl -OL http://downloads.lede-project.org/releases/17.01.0/packages/mipsel_24kc/base/Packages.gz
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100 47270  100 47270    0     0   168k      0 --:--:-- --:--:-- --:--:--  168k

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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=675#comment2315