rpm: Add fix for CVE-2021-20266

Adding fix for CVE-2021-20266
Upstream-Status: Backport [https://github.com/rpm-software-management/rpm/pull/1587/commits/9646711891df851dfbf7ef54cc171574a0914b15

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Note: Hunk#2 and Hunk#3 refreshed to apply patch and match value of
dl_max variable to make it with current version
All Hunks are refreshed to solve patch-fuzz

Signed-off-by: Ranjitsinh Rathod <ranjitsinh.rathod@kpit.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>