Removed old-style function defintions from vmalloc

Removed old-style function defintions from vmalloc

The functions definitions in vmalloc are all surrounded by an `#if __STD_C`, if __STD_C is not defined than the old style function definition is used. These days STD C is the standard and the old style function defintions are obsolete.
They have been removed from lib/vmalloc and its subprojects, comments have been preserved by converting them to a Doxygen style.