Migrate to Jinja2 compiler syntax

[regro-cf-autotick-bot]

This PR was created by the cf-regro-autotick-bot.

The cf-regro-autotick-bot is a service to automatically track the dependency graph, migrate packages, and propose package version updates for conda-forge. It is very likely that the current package version for this feedstock is out of date or needed migration.

List of changes done to the recipe: Renamed build with host Removing pinnings for boost-cpp to use values from conda_build_config.yaml Moving cmake from host to build Removing pinnings for gmp to use values from conda_build_config.yaml Removing pinnings for mpfr to use values from conda_build_config.yaml Removing toolchain in favour of compiler() Adding Fortran compiler Adding C compiler Adding C++ compiler

If you have recived a Migrate to Jinja2 compiler syntax PR from me recently please close that one and use this one. Notes and instructions for merging this PR:

1. Please merge the PR only after the tests have passed.
2. Feel free to push to the bot's branch to update this PR if needed. If you would like a local version of this bot, you might consider using rever. Rever is a tool for automating software releases and forms the backbone of the bot's conda-forge PRing capability. Rever is both conda (conda install -c conda-forge rever) and pip (pip install re-ver) installable.

Finally, feel free to drop us a line if there are any issues!

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.