boost: use cppstd_flag(), clean up cppstd handling, use can_run()
#25963
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Summary
Changes to recipe: boost/[*]
Motivation
Fixes conan-io/conan#17322, which fails due to C++26 not yet being supported in the recipe.
Gets rid of about 250 lines of logic that was there solely to work around potentially missing
compiler.cppstdinfo.Details
Also replaces
cross_building()used to disable running of test executables.not can_run()is a more appropriate check there.cppstd_flag()is available since Conan 2.2.0, so I adjustedrequired_conan_versionaccordingly.I'm aware of the request to leave Conan v1 legacy cleanup to the team, but this also fixes a functional issue in the recipe and seemed appropriate. Feel free to close this one if you disagree. I don't intend to open any additional ones.