Bugfix: missing framework for xcode generator with no compiler setting

[SSE4]

closes: #9878

Changelog: Bugfix: Missing framework for Xcode generator with no compiler setting.
Docs: omit

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[memsharded]

This is very hacky, simply overriding this with a local compiler is very dirty.
If the format_frameworks has this implementation:

def format_frameworks(frameworks, settings):
    """
    returns an appropriate compiler flags to link with Apple Frameworks
    or an empty array, if Apple Frameworks aren't supported by the given compiler
    """
    compiler = settings.get_safe("compiler")
    compiler_base = settings.get_safe("compiler.base")
    if (str(compiler) not in GCC_LIKE) and (str(compiler_base) not in GCC_LIKE):
        return []
    return ["-framework %s" % framework for framework in frameworks]

With your hack, this means that it will be compiler independent, so it would be good to do just:

self.frameworks = " ".join(["-framework %s" % framework for framework in frameworks])

If it is safe to assume that in Xcode, the frameworks will always be there, which probably doesn't hold for cross-building (is cross-building to some platform that won't accept frameworks possible with Xcode?)

[SSE4]

so far, I didn't see such cross-building. AFAIK it allows only cross-building to apple platforms (iOS, tvOS, watchOS). I think at least for now, we can assume Xcode supports frameworks, and it only supports apple-clang compiler. or at least we can say conan supports only that use-case.