wcwidth: check a macro version of wcwidth () as well Check the functionality of a macro version wcwidth () as well as a real function. This is better than undefining wcwidth on OS/2 kLIBC without functional check. * lib/wchar.in.h: Revert commit caee51. * m4/wcwidth.m4 (gl_cv_func_wcwidth_macro): Check if wcwidth () is a macro.