cl/gcc-adapt-ext: malloc(), calloc(), realloc() and free() test added.

NOTE: This tests the allocation done with the functions above, which are
      defined as part of <cstdlib>. It also tests the 'placement new'
      for calling the constructors of such created objects and explicit
      calls of destructors.
Merge branch 'extension/malloc-and-free' into cl/gcc-adapt-ext