Fix build on powerpc64 from Sebastian

Fix build on powerpc64 from Sebastian

* merges:
  fix, adhere to prototypes in libpq-he.h, use size_t* instead of unsigned int*
  fix to fix, PEBKAC, also include ent.h goodies in cl-loop code
  minor, clarify usage of ase_ffsl in skiplist.c
  minor, provide (missing) ffsl for ppc64 and flsl for ppc and ppc64
  minor, provide __next_2power() from the bithacks web site
  cosmetics, include ent/ent.h (or one of its sub-includes) directly, take 2, ...
  cosmetics, include ent/ent.h (or one of its sub-includes) directly ...
  cosmetics, do not include all of ent.h in lisp.h ...