* intermediate installation directory is deleted before performing installation step
* final installation directory, deps or output, is deleted before merging platforms from intermediate directories
if pkg-config is invoked indirectly, e.g., from library/tool build script at configuration step, prefix variable remained undefined
* --static is longer hardcoded in wrapper script but passed by aedi
* use utf-8 for pkgconf output handling
* update wrapper script header with actual description and copyright years
* use original pkgconf executable name
