[package] mpfr/4.1.0 lacks support for Conan 2.0

[System-Arch]

Description

mpfr has yet to be ported to Conan 2.0

Package and Environment Details

• Package Name/Version: mpfr/4.1.0
• Operating System+version: Debian 10
• Compiler+version: gcc 8
• Conan version: conan 2.0.0-beta6
• Python version: Python 3.7.3

Conan profile

Profile host:
[settings]
arch=x86_64
build_type=Release
compiler=gcc
compiler.libcxx=libstdc++11
compiler.version=8
os=Linux
[options]
cmake*:bootstrap=True
[tool_requires]
!openssl*: cmake/3.24.2

Steps to reproduce

conan-2.0 build -pr:b tools.jinja -pr:h tools.jinja --name mpfr --version 4.1.0 .

Logs

Click to expand log

conan-2.0 build -pr:b tools.jinja -pr:h tools.jinja --name mpfr --version 4.1.0 .  # --build=never

-------- Input profiles --------
Profile host:
[settings]
arch=x86_64
build_type=Release
compiler=gcc
compiler.libcxx=libstdc++11
compiler.version=8
os=Linux
[options]
cmake*:bootstrap=True
[tool_requires]
!openssl*: cmake/3.24.2

Profile build:
[settings]
arch=x86_64
build_type=Release
compiler=gcc
compiler.libcxx=libstdc++11
compiler.version=8
os=Linux
[options]
cmake*:bootstrap=True
[tool_requires]
!openssl*: cmake/3.24.2

ERROR: Error loading conanfile at '/tmp/tmp.Sid2gTN7Pg/mpfr/conanfile.py': Unable to load conanfile in /tmp/tmp.Sid2gTN7Pg/mpfr/conanfile.py
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/tmp/tmp.Sid2gTN7Pg/mpfr/conanfile.py", line 1, in <module>
    from conans import ConanFile, AutoToolsBuildEnvironment, CMake, tools
ImportError: cannot import name 'ConanFile' from 'conans' (/mathworks/devel/sandbox/marc/conan-2.0/conan-io/conans/__init__.py)

ERROR: Conan-2.0 build failed for 'mpfr'```

</details>

[System-Arch]

Will submit proposed compatibility changes shortly