Wrap FLINT 2.6 functions, drop support for system FLINT < 2.6

[mkoeppe]

(split out from #31069)

CC: @dimpase

Component: packages: standard

Author: Vincent Delecroix, Matthias Koeppe

Branch/Commit: 7b1dee7

Reviewer: Dima Pasechnik

Issue created by migration from https://trac.sagemath.org/ticket/31525

[mkoeppe]

Branch: u/mkoeppe/wrap_flint_2_6_functions__drop_support_for_system_flint___2_6

[mkoeppe]

New commits:

d1a3d23	31069: flint declarations
7b1dee7	build/pkgs/flint/spkg-configure.m4: Reject FLINT < 2.6.0

[mkoeppe]

Commit: 7b1dee7

[mkoeppe]

Changed author from Vincent Delecroix to Vincent Delecroix, Matthias Koeppe

[mkoeppe]

Dependencies: merge in 9.4 only

[dimpase]

comment:5

version of Flint matters for deformation, see #30325

[dimpase]

Reviewer: Dima Pasechnik

[dimpase]

comment:6

lgtm

[mkoeppe]

Changed dependencies from merge in 9.4 only to none

[vbraun]

Changed branch from u/mkoeppe/wrap_flint_2_6_functions__drop_support_for_system_flint___2_6 to 7b1dee7