fix(plugins): convert set_languages() latest standard to cmake

[offscum]

This fix convert languages last standard to cmake, for example:

set_languages('clatest', 'gnulatest', 'cxxlatest', 'gnuxxlatest')

This will generate the following code separately:

• clatest

set_target_properties(<target> PROPERTIES C_EXTENSIONS OFF)
foreach(standard 23 17 11 99 90)
    include(CheckCCompilerFlag)
    if(MSVC)
        check_c_compiler_flag("/std:c${standard}" <target>_support_c_standard_${standard})
    else()
        check_c_compiler_flag("-std=c${standard}" <target>_support_c_standard_${standard})
    endif()
    if(<target>_support_c_standard_${standard})
        target_compile_features(<target> PRIVATE c_std_${standard})
        break()
    endif()
endforeach()

• gnulatest

set_target_properties(<target> PROPERTIES C_EXTENSIONS ON)
foreach(standard 23 17 11 99 90)
    include(CheckCCompilerFlag)
    if(MSVC)
        check_c_compiler_flag("/std:gnu${standard}" <target>_support_gnu_standard_${standard})
    else()
        check_c_compiler_flag("-std=gnu${standard}" <target>_support_gnu_standard_${standard})
    endif()
    if(<target>_support_gnu_standard_${standard})
        target_compile_features(<target> PRIVATE c_std_${standard})
        break()
    endif()
endforeach()

• cxxlatest

set_target_properties(<target> PROPERTIES CXX_EXTENSIONS OFF)
foreach(standard 26 23 20 17 14 11 98)
    include(CheckCXXCompilerFlag)
    if(MSVC)
        check_cxx_compiler_flag("/std:c++${standard}" <target>_support_c++_standard_${standard})
    else()
        check_cxx_compiler_flag("-std=c++${standard}" <target>_support_c++_standard_${standard})
    endif()
    if(<target>_support_c++_standard_${standard})
        target_compile_features(<target> PRIVATE cxx_std_${standard})
        break()
    endif()
endforeach()

• gnuxxlatest

set_target_properties(<target> PROPERTIES CXX_EXTENSIONS ON)
foreach(standard 26 23 20 17 14 11 98)
    include(CheckCXXCompilerFlag)
    if(MSVC)
        check_cxx_compiler_flag("/std:gnu++${standard}" <target>_support_gnu++_standard_${standard})
    else()
        check_cxx_compiler_flag("-std=gnu++${standard}" <target>_support_gnu++_standard_${standard})
    endif()
    if(<target>_support_gnu++_standard_${standard})
        target_compile_features(<target> PRIVATE cxx_std_${standard})
        break()
    endif()
endforeach()