Revert "Update libflint to 3.4.0"

[ryanking13]

Reverts #501

python-flint is failing to build with the new libflint:

Invalid FLINT version:                                                          
Version needed is: FLINT >=3.0, <3.4                                            
Version found is: FLINT == 3.4.0  

[ryanking13]

cc: @mkoeppe

It seems like the current python-flint version is incompatible with the libflint 3.4. Could you update the python-flint as well too to make is compatible with the libflint version you want to use?

[github-actions]

Package Build Results

Total packages built: 19
Total build time: 0:00:13

Package Build Times (click to expand)

Package	Build Time
regex	7s
pydoc_data	4s
atomicwrites	3s
MarkupSafe	3s
pytest	1s
setuptools	1s
micropip	1s
pytz	1s
attrs	1s
Jinja2	1s
tblib	1s
py	1s
more-itertools	1s
pytest-asyncio	1s
pluggy	1s
pyparsing	1s
exceptiongroup	1s
iniconfig	1s
six	0s

Longest build: regex (7s)
Packages built in more than 10 minutes: 0

[mkoeppe]

I've opened flintlib/python-flint#375 to request a compatible release

[oscarbenjamin]

I'm not sure what the build command used here is but the meson configuration setting to control this is

meson setup build -Dflint_version_check=false

or for example

pip install -Csetup-args="Dflint_version_check=false" .

The version check is defensive and is there because each of FLINT 3.0, 3.1, 3.2 and 3.3 has broken the build of python-flint and it is better to fail early with an error message about the FLINT version rather than fail later with cryptic compilation failure.

As it happens it seems that FLINT 3.4 does not have any change that breaks the build of python-flint but in flintlib/python-flint#376 I found that there is a problem building FLINT 3.4 itself in pyodide.