Bug#984136: fplll: ftbfs with GCC-11

[Nilesh Patra]

control: tags -1 patch

Fixed in the commit:

https://salsa.debian.org/science-team/fplll/-/commit/af75e051c4ffd116b0d7ed0eb1e38dacee913123

and can be uploaded post bullseye release.

Nilesh