conanfile: set compatibility_cppstr = False.

The Catch libraries have different API/ABI depending on the c++
standard they are compiled with. For example, the following function
isn't in the binary when compiled with C++14, only with C++17 or later:

StringMaker<std::string_view>::convert(std::string_view str);

By default, Conan is allowed to serve Catch libraries compiled in C++14
into a project using C++17/20, potentially causing linker errors
because of missing symbols. This PR overrides this default behaviour:
the C++ standard of the Catch library will exactly match the one of
the requiring project (building Catch from source if necessary).

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