Add command line flags for host profile.

[TobiSchluter]

This seems to be missing. With this, I can cross-build out of the box akin to

conan_cmake_run(
    SETTINGS ${settings}
    ENV ${conan_env}
    PROFILE_BUILD default
    PROFILE_HOST android

    REQUIRES
    boost/1.78.0
    catch2/2.13.8
    eigen/3.4.0
    expected-lite/0.6.2
    fmt/9.1.0
    nlohmann_json/3.11.2
    openssl/1.1.1o
    valijson/0.6
    BASIC_SETUP
    CMAKE_TARGETS
    CONAN_COMMAND ${CONAN_CMD}

    OPTIONS
    boost:without_stacktrace=True
    BUILD missing

    GENERATORS cmake_find_package)

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[TobiSchluter]

I seem to have managed to mess up this patch when copying it between my trees, sorry about the two separate commits. Now it includes the whole change.

[TobiSchluter]

Any interest? Just ran into this again when updating.
I have another patch which adds support for -c flags, but I'd like to get this out of the way first.

[memsharded]

Hi @TobiSchluter

Thanks for your contribution, and sorry for taking so long to check it. We have been focused on releasing 2.0, and also for the new cmake-conan integration based on the new CMake dependency providers, there have been a few things that have fallen through the cracks.

[memsharded]

This hardcoded check repeated for every profile seems wrong. It seems the previous one for PROFILE_BUILD was a bit legacy and dirty, it shouldn't be done that way.