t/e_perlcc.t: oops, fix skipped test
C: Support local $/ = "somestring" (only used empty values before) #314

A regression from 1.43
added testcases to t/issue256.t
Also inc the refcnt of PL_rs if used as such
  for t/C-COMPILED/CORE--base--rs.t

Note that PL_ors_sv not, since this is NULL (not even PL_sv_undef) as default.