Currently if a target uses link_whole, and one of those archives is a
C++, but the files for the target are C linking will fail when the C
linker attempts to link the C++ files. This patches add
link_whole_targets to the list of languages in the target so the correct
linker will be selected.
Commit 325a231a added stricter keyword argument checking, but didn't enable
keyword arguments for add_projects_link_arguments() and
add_global_link_arguments(). This makes them fail with this error:
Meson encountered an error in file meson.build, line 19, column 0:
Function does not take keyword arguments.
However, the language argument is required. Removing it produces this error
instead:
Meson encountered an error in file meson.build, line 19, column 0:
Missing language definition in add_project_link_arguments
Fix this by adding 'language' as a required keyword argument. Also add calls to
these in the "146 C and CPP link" test case.