re PR fortran/20058 (Error on kind 16 hex data statement)

PR fortran/20058
* trans-types.c (gfc_max_integer_kind): Declare
  (gfc_init_kinds): Initialize it.
* gfortran.h (gfc_max_integer_kind): extern it.
* primary.c (match_boz_constant): Use it; remove gfortran extension
  of kind suffixes on BOZ literal constants

From-SVN: r95643